[Broadcom] Upgrade xgs SAI to 10.1.6.0 (sonic-net#18044)

Why I did it
Upgrade the xgs SAI version to 10.1.6.0 to include the following fix:

10.1.6.0: [CS00012332630][SAI_BRANCH rel_ocp_sai_10_1] SAI - OTHER - [SAI BUG] sflow use psample to send packet, but the psample in linux version is not right.
10.1.4.0: [CS00012329827]ECMP LB traffic polarization, configure hash_offset along with hash_seed attr
10.1.3.0: Double commit test code fixes in EM for 10.1.
10.1.2.0: fix ODP packaging in rel_ocp_sai_10_1
10.1.1.0: Use knet-cb procfs path for DNX port speed sampling rate (does not use new genl)
Work item tracking
Microsoft ADO (number only): 26720003
How I did it
Upgrade xgs SAI version in sai.mk file.

How to verify it
Run full qual on s6100 T1: https://elastictest.org/scheduler/testplan/65c1c2e69e3e72f540cae34b

platform/broadcom/sai.mk

@@ -1,4 +1,4 @@
-LIBSAIBCM_XGS_VERSION = 10.1.0.0
+LIBSAIBCM_XGS_VERSION = 10.1.6.0
 LIBSAIBCM_DNX_VERSION = 9.2.12.1
 LIBSAIBCM_XGS_BRANCH_NAME = SAI_10.1.0_GA
 LIBSAIBCM_DNX_BRANCH_NAME = SAI_9.2.0.3