tests/subsys/usb/bos/usb.bos fails with native_posix and llvm/clang

[nashif]

Describe the bug
currently the test fails when built with clang/llvm.

export ZEPHYR_TOOLCHAIN_VARIANT=llvm
twister -p native_posix -T tests/subsys/usb/bos/

*** Booting Zephyr OS build zephyr-v2.4.0-1831-g018d2b2325c9  ***
Running test suite test_osdesc
===================================================================
START - test_usb_bos_macros
length 57
D: Header
D: 05 0f 00 00 00 18 10 05 |........
D: 00 38 b6 08 34 a9 09 a0 |.8..4...
D: 47 8b fd a0 76 88 15 b6 |G...v...
D: 65 00 01 01 01 1c 10 05 |e.......
D: 00 df 60 dd d8 89 45 c7 |..`...E.
D: 4c 9c d2 65 9d 9e 64 8a |L..e..d.
D: 9f 00 00 03 06 03 00 02 |........
D: 00                      |.
D: webusb cap
D: 05 0f 39 00 02 18 10 05 |..9.....
D: 00 38 b6 08 34 a9 09 a0 |.8..4...
D: 47 8b fd a0 76 88 15 b6 |G...v...
D: webusb cap msos v2
D: 05 0f 39 00 02 1c 10 05 |..9.....
D: 00 df 60 dd d8 89 45 c7 |..`...E.
D: 4c 9c d2 65 9d 9e 64 8a |L..e..d.
D: 9f 00 00 03             |....

    Assertion failed at CMAKE_SOURCE_DIR/src/test_bos.c:194: test_usb_bos_macros: (!memcmp(hdr, &webusb_bos_descriptor, len) || !memcmp(hdr, &webusb_bos_descriptor_2, len) is false)
Wrong data
 FAIL - test_usb_bos_macros
===================================================================
START - test_usb_bos
test_usb_bos: ret 0 len 57 data 0x80576d9

    Assertion failed at CMAKE_SOURCE_DIR/src/test_bos.c:216: test_usb_bos: (!memcmp(data, &webusb_bos_descriptor, len) || !memcmp(data, &webusb_bos_descriptor_2, len) is false)
Wrong data
 FAIL - test_usb_bos
===================================================================
Test suite test_osdesc failed.
===================================================================
PROJECT EXECUTION FAILED

Expected behavior
Test should pass.

Impact
Not able to integrate CI testing for clang/llvm

Logs and console output
See above

Environment (please complete the following information):

• OS: Linux
• Toolchain clang/llvm 10.