[FRR]: Add support for SRv6 SID Manager

#### Why I did it

Bring the below PRs from FRR mainline to SONiC in order to support SRv6 SID Manager in SONiC.

#### New patches that were added

| Patch             | FRR Pull Request |
| ------------- | ----------------- |
| 0064-SRv6-BGP-SID-reachability.patch | FRRouting/frr#14810 |
| 0065-zebra-display-srv6-encapsulation-source-address-when-configured.patch | FRRouting/frr#16151 |
| 0066-lib-fix-srv6-locator-flags-propagated-to-isis.patch | FRRouting/frr#15673 |
| 0067-Add-support-for-SRv6-SID-Manager.patch | FRRouting/frr#15604 |
| 0068-bgpd-Extend-BGP-to-communicate-with-the-SRv6-SID-Manager-to-allocate-release-SRv6-SIDs.patch | FRRouting/frr#15676 |