Mount directory warmboot in docker gbsyncd (#11852)

Why I did it
The directory /var/warmboot as top directory for warmboot feature is also needed in docker gbsyncd. Some vendor SAI might save data under it. Without it, the SAI init/creation API failure has happened on PikeZ platform.

How I did it
Mount host directory /host/warmboot as /var/warmboot in docker gbsyncd, which is same as what it has done on docker syncd.

Author: jimmyzhai

platform/components/docker-gbsyncd-broncos.mk

@@ -30,6 +30,7 @@ $(DOCKER_GBSYNCD_BRONCOS)_CONTAINER_NAME = gbsyncd
 $(DOCKER_GBSYNCD_BRONCOS)_RUN_OPT += --privileged -t
 $(DOCKER_GBSYNCD_BRONCOS)_RUN_OPT += -v /host/machine.conf:/etc/machine.conf
 $(DOCKER_GBSYNCD_BRONCOS)_RUN_OPT += -v /etc/sonic:/etc/sonic:ro
+$(DOCKER_GBSYNCD_BRONCOS)_RUN_OPT += -v /host/warmboot:/var/warmboot
 
 SONIC_ONLINE_DEBS += $(LIBSAI_BRONCOS)
 

platform/template/docker-gbsyncd-base.mk

@@ -27,3 +27,4 @@ $(DOCKER_GBSYNCD_BASE)_CONTAINER_NAME = gbsyncd
 $(DOCKER_GBSYNCD_BASE)_RUN_OPT += --privileged -t
 $(DOCKER_GBSYNCD_BASE)_RUN_OPT += -v /host/machine.conf:/etc/machine.conf
 $(DOCKER_GBSYNCD_BASE)_RUN_OPT += -v /etc/sonic:/etc/sonic:ro
+$(DOCKER_GBSYNCD_BASE)_RUN_OPT += -v /host/warmboot:/var/warmboot