[broadcom sai] upgrade Broadcom SAI to version 3.1.3.4-12 (#1740)

Signed-off-by: Ying Xie <ying.xie@microsoft.com>

Author: yxieca

platform/broadcom/sai.mk

@@ -1,9 +1,9 @@
-BRCM_SAI = libsaibcm_3.1.3.4-11_amd64.deb
-$(BRCM_SAI)_URL = "https://sonicstorage.blob.core.windows.net/packages/libsaibcm_3.1.3.4-11_amd64.deb?sv=2015-04-05&sr=b&sig=0pctCvAKfSqT8O%2FWSMxw532XAXFsxXdKljQqWfOX8xA%3D&se=2155-03-25T07%3A23%3A41Z&sp=r"
+BRCM_SAI = libsaibcm_3.1.3.4-12_amd64.deb
+$(BRCM_SAI)_URL = "https://sonicstorage.blob.core.windows.net/packages/libsaibcm_3.1.3.4-12_amd64.deb?sv=2015-04-05&sr=b&sig=iK79gjz8GQnPLU8OSxgzw35MzqmxwAXQg2N%2BalLUos0%3D&se=2032-01-31T20%3A36%3A51Z&sp=r"
 
-BRCM_SAI_DEV = libsaibcm-dev_3.1.3.4-11_amd64.deb
+BRCM_SAI_DEV = libsaibcm-dev_3.1.3.4-12_amd64.deb
 $(eval $(call add_derived_package,$(BRCM_SAI),$(BRCM_SAI_DEV)))
-$(BRCM_SAI_DEV)_URL = "https://sonicstorage.blob.core.windows.net/packages/libsaibcm-dev_3.1.3.4-11_amd64.deb?sv=2015-04-05&sr=b&sig=IO1g%2FdcObkureizN8ZMPqISP6opZXu%2FrHostog6aIrU%3D&se=2155-03-25T08%3A13%3A34Z&sp=r"
+$(BRCM_SAI_DEV)_URL = "https://sonicstorage.blob.core.windows.net/packages/libsaibcm-dev_3.1.3.4-12_amd64.deb?sv=2015-04-05&sr=b&sig=tSBPnK%2BK9axdPbkWP19r5ngM0ggRTWWijUIKTl8WNW0%3D&se=2032-01-31T20%3A36%3A11Z&sp=r"
 
 SONIC_ONLINE_DEBS += $(BRCM_SAI) $(BRCM_SAI_DEV)
 $(BRCM_SAI_DEV)_DEPENDS += $(BRCM_SAI)