sdk: pass a C define of what architecture we build for to all compilations

This is needed for programs which use Broadcom hacks and workarounds,
for example; snmpd.

iopsys-brcm63xx-arm/Makefile

@@ -12,6 +12,7 @@ BOARDNAME:=Iopsys Broadcom ARM
 FEATURES:=usb jffs2_nand nand ubifs
 MAINTAINER:=Benjamin Larsson <benjamin.larsson@inteno.se>
 CFLAGS:=-Os -pipe -march=armv7-a -mfpu=vfpv3-d16 -mfloat-abi=softfp
+CFLAGS += -DCONFIG_TARGET_iopsys_brcm63xx_arm
 
 LINUX_VERSION:=4.1.27
 

iopsys-brcm63xx-mips/Makefile

@@ -12,6 +12,7 @@ BOARDNAME:=Iopsys Broadcom MIPS
 FEATURES:=usb nand ubifs
 MAINTAINER:=Benjamin Larsson <benjamin.larsson@inteno.se>
 CFLAGS:=-Os -pipe -mips32 -mtune=mips32 -fno-caller-saves
+CFLAGS += -DCONFIG_TARGET_iopsys_brcm63xx_mips
 
 LINUX_VERSION:=4.1.27