Fix out-of-tree Broadcom kernel module build

The inclusion of bcm-kernel-toolchain.mk cannot be conditional since
CONFIG_TARGET_brcmbca is not defined when package metadata is being
generated. Instead make it optional in case broadcom feed is absent.

ebtables-extensions/Makefile

@@ -189,9 +189,7 @@ define KernelPackage/ebt-mldsnooping/description
 	Kernel module to enable MLD snooping for ebtables
 endef
 
-ifeq ($(CONFIG_TARGET_brcmbca),y)
-	include ../../broadcom/bcmkernel/bcm-kernel-toolchain.mk
-endif
+-include ../../broadcom/bcmkernel/bcm-kernel-toolchain.mk
 
 define Build/Prepare
 

gryphon-led-module/Makefile

@@ -28,7 +28,6 @@ define KernelPackage/$(PKG_NAME)
   FILES:=$(PKG_BUILD_DIR)/$(PKG_NAME).$(LINUX_KMOD_SUFFIX)
   KCONFIG:=CONFIG_PACKAGE_kmod-gryphon-led-kernel-module=y
   AUTOLOAD:=$(call AutoLoad,60,$(PKG_NAME))
-  DEPENDS:= +(TARGET_brcmbca):bcm963xx-bsp
   PKG_LICENSE:=GPLv2
   PKG_LICENSE_URL:=
 endef
@@ -42,7 +41,7 @@ EXTRA_KCONFIG:= CONFIG_RGB_LED=m
 MODULE_INCLUDE=-I$(PKG_BUILD_DIR)
 
 # support compilation against BCM SDK kernel
-include ../../broadcom/bcmkernel/bcm-kernel-toolchain.mk
+-include ../../broadcom/bcmkernel/bcm-kernel-toolchain.mk
 
 define Build/Prepare
 	mkdir -p $(PKG_BUILD_DIR)/kdevlinks/

ipt-trigger/Makefile

@@ -46,9 +46,7 @@ define KernelPackage/ip6t-trigger/description
 	Kernel module to enable port trigger for ip6tables
 endef
 
-ifeq ($(CONFIG_TARGET_brcmbca),y)
-	include ../../broadcom/bcmkernel/bcm-kernel-toolchain.mk
-endif
+-include ../../broadcom/bcmkernel/bcm-kernel-toolchain.mk
 
 ifeq ($(LOCAL_DEV),1)
 define Build/Prepare