[build] make second Accton Debian package extra package of the first …

…one (#1257)

Both packages are built with a single build command. We only have to
take the second one after the first one is built.

platform/broadcom/platform-modules-accton.mk

@@ -13,7 +13,6 @@ $(ACCTON_AS7712_32X_PLATFORM_MODULE)_PLATFORM = x86_64-accton_as7712_32x-r0
 SONIC_DPKG_DEBS += $(ACCTON_AS7712_32X_PLATFORM_MODULE)
 
 ACCTON_AS5712_54X_PLATFORM_MODULE = sonic-platform-accton-as5712-54x_$(ACCTON_AS5712_54X_PLATFORM_MODULE_VERSION)_amd64.deb
-$(ACCTON_AS5712_54X_PLATFORM_MODULE)_SRC_PATH = $(PLATFORM_PATH)/sonic-platform-modules-accton
-$(ACCTON_AS5712_54X_PLATFORM_MODULE)_DEPENDS += $(LINUX_HEADERS) $(LINUX_HEADERS_COMMON)
 $(ACCTON_AS5712_54X_PLATFORM_MODULE)_PLATFORM = x86_64-accton_as5712_54x-r0
+$(eval $(call add_extra_package,$(ACCTON_AS7712_32X_PLATFORM_MODULE),$(ACCTON_AS5712_54X_PLATFORM_MODULE)))
 SONIC_DPKG_DEBS += $(ACCTON_AS5712_54X_PLATFORM_MODULE)