[libsaibcm] Update pointer to Broadcom SAI debian package

[smaheshm]

- Why I did it
The last BRCM SAI debian package missed including a dependency for libprotobuf, causing some processes to not run. (#4682)

- How I did it
Added libprotobuf dependency in BRCM SAI debian package.

- How to verify it
Loaded sonic-broadcom.bin in BRCM chipset, verified all the processes are up and running.

admin@str-s6000-acs-8:~$ docker exec -it syncd bash
root@str-s6000-acs-8:/#  ldd /usr/bin/syncd
        linux-vdso.so.1 (0x00007fff3c285000)
        libsaimetadata.so.0 => /usr/lib/x86_64-linux-gnu/libsaimetadata.so.0 (0x00007f5f3b857000)
        libsaimeta.so.0 => /usr/lib/x86_64-linux-gnu/libsaimeta.so.0 (0x00007f5f3b4ab000)
        libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f5f3b2a7000)
        libhiredis.so.0.14 => /usr/lib/x86_64-linux-gnu/libhiredis.so.0.14 (0x00007f5f3b097000)
        libswsscommon.so.0 => /usr/lib/x86_64-linux-gnu/libswsscommon.so.0 (0x00007f5f3ae1f000)
        libsai.so.1 => /usr/lib/libsai.so.1 (0x00007f5f32c71000)
        libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f5f32a54000)
        libstdc++.so.6 => /usr/lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007f5f326d2000)
        libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f5f323ce000)
        libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007f5f321b7000)
        libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f5f31e18000)
        /lib64/ld-linux-x86-64.so.2 (0x00007f5f3bd9e000)
        libnl-genl-3.so.200 => /lib/x86_64-linux-gnu/libnl-genl-3.so.200 (0x00007f5f31c11000)
        libnl-nf-3.so.200 => /usr/lib/x86_64-linux-gnu/libnl-nf-3.so.200 (0x00007f5f319f8000)
        libnl-route-3.so.200 => /usr/lib/x86_64-linux-gnu/libnl-route-3.so.200 (0x00007f5f31773000)
        libnl-3.so.200 => /lib/x86_64-linux-gnu/libnl-3.so.200 (0x00007f5f31551000)
        librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007f5f31349000)
        libprotobuf.so.10 => /usr/lib/x86_64-linux-gnu/libprotobuf.so.10 (0x00007f5f30ed8000)
        libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007f5f30cbe000)
root@str-s6000-acs-8:/# ldd /usr/lib/libsai.so.1
        linux-vdso.so.1 (0x00007fff191c3000)
        libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f5073611000)
        libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f50733f4000)
        librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007f50731ec000)
        libprotobuf.so.10 => /usr/lib/x86_64-linux-gnu/libprotobuf.so.10 (0x00007f5072d7b000)
        libstdc++.so.6 => /usr/lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007f50729f9000)
        libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f50726f5000)
        libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f5072356000)
        libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007f507213f000)
        /lib64/ld-linux-x86-64.so.2 (0x00007f507b9c3000)
        libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007f5071f25000)

admin@str-s6000-acs-8:~$ show ver

SONiC Software Version: SONiC.master.0-dirty-20200604.215057
Distribution: Debian 10.4
Kernel: 4.19.0-6-amd64
Build commit: 9f77e2e7
Build date: Fri Jun  5 01:21:24 UTC 2020
Built by: samaddik@samaddik-vm-01

Platform: x86_64-dell_s6000_s1220-r0
HwSKU: Force10-S6000
ASIC: broadcom
Serial Number: Platform did not indicate serial number
Uptime: 17:13:32 up 22 min,  1 user,  load average: 1.09, 1.56, 1.77

- Description for the changelog
[libsaibcm] Update pointer to BRCM SAI debian package.

- A picture of a cute animal (not mandatory but encouraged)

[lguohan]

retest mellanox please

[smaheshm]

retest vsimage please

[abdosi]

Not needed for 201911. It used 3.7.5.1-x track which does not have this issue.