Add some config options to make gbsyncd optional (#16840)

Why I did it
In an effort to allow people to build a slim version of SONiC to fit on devices to small storage, there is a need to disable some unneeded features.
The docker-gbsyncd are only applicable to devices with external gearboxes and might not apply to devices that need a small image.
It is therefore desirable to have a knob to not include these gbsyncd containers.

Work item tracking
Microsoft ADO (number only):
How I did it
Add a new config INCLUDE_GBSYNCD which is enabled by default to retain the previous behavior.
Setting it to n will not include the platform/components/docker-gbsyncd-*.mk.

How to verify it
Set INCLUDE_GBSYNCD = n and witness that docker-gbsyncd images are not present in the final image.

platform/broadcom/one-aboot.mk

@@ -4,7 +4,9 @@ SONIC_ONE_ABOOT_IMAGE = sonic-aboot-broadcom.swi
 $(SONIC_ONE_ABOOT_IMAGE)_MACHINE = broadcom
 $(SONIC_ONE_ABOOT_IMAGE)_DEPENDENT_MACHINE = broadcom-dnx
 $(SONIC_ONE_ABOOT_IMAGE)_IMAGE_TYPE = aboot
+ifeq ($(INCLUDE_GBSYNCD), y)
 $(SONIC_ONE_ABOOT_IMAGE)_INSTALLS += $(PHY_CREDO)
+endif
 $(SONIC_ONE_ABOOT_IMAGE)_INSTALLS += $(FLASHROM)
 $(SONIC_ONE_ABOOT_IMAGE)_INSTALLS += $(SYSTEMD_SONIC_GENERATOR)
 $(SONIC_ONE_ABOOT_IMAGE)_LAZY_BUILD_INSTALLS = $(BRCM_OPENNSL_KERNEL) $(BRCM_DNX_OPENNSL_KERNEL)

platform/broadcom/rules.dep

@@ -29,5 +29,7 @@ include $(PLATFORM_PATH)/one-aboot.dep
 include $(PLATFORM_PATH)/libsaithrift-dev.dep
 include $(PLATFORM_PATH)/docker-syncd-brcm-dnx.dep
 include $(PLATFORM_PATH)/docker-syncd-brcm-dnx-rpc.dep
+ifeq ($(INCLUDE_GBSYNCD), y)
 include $(PLATFORM_PATH)/../components/docker-gbsyncd-credo.dep
 include $(PLATFORM_PATH)/../components/docker-gbsyncd-broncos.dep
+endif

platform/broadcom/rules.mk

@@ -29,8 +29,10 @@ include $(PLATFORM_PATH)/one-aboot.mk
 include $(PLATFORM_PATH)/libsaithrift-dev.mk
 include $(PLATFORM_PATH)/docker-syncd-brcm-dnx.mk
 include $(PLATFORM_PATH)/docker-syncd-brcm-dnx-rpc.mk
+ifeq ($(INCLUDE_GBSYNCD), y)
 include $(PLATFORM_PATH)/../components/docker-gbsyncd-credo.mk
 include $(PLATFORM_PATH)/../components/docker-gbsyncd-broncos.mk
+endif
 
 BCMCMD = bcmcmd
 $(BCMCMD)_URL = "https://sonicstorage.blob.core.windows.net/packages/20190307/bcmcmd?sv=2015-04-05&sr=b&sig=sUdbU7oVbh5exbXXHVL5TDFBTWDDBASHeJ8Cp0B0TIc%3D&se=2038-05-06T22%3A34%3A19Z&sp=r"

rules/config

@@ -170,6 +170,9 @@ ENABLE_NATIVE_WRITE = y
 # INCLUDE_MACSEC - build docker-macsec for macsec support
 INCLUDE_MACSEC = y
 
+# INCLUDE_GBSYNCD - build docker-gbsyncd-* for gearbox support
+INCLUDE_GBSYNCD ?= y
+
 # INCLUDE_TEAMD - build docker-teamd for LAG protocol support
 INCLUDE_TEAMD ?= y