arm: Enable generic board support

This enables generic board support so that ARM boards can define
CONFIG_SYS_GENERIC_BOARD.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/arm/lib/Makefile b/arch/arm/lib/Makefile
index 57111af..24c7e7a 100644
--- a/arch/arm/lib/Makefile
+++ b/arch/arm/lib/Makefile
@@ -39,7 +39,10 @@
 SOBJS-y += crt0.o
 
 ifndef CONFIG_SPL_BUILD
+ifndef CONFIG_SYS_GENERIC_BOARD
 COBJS-y	+= board.o
+endif
+
 COBJS-y	+= bootm.o
 COBJS-$(CONFIG_SYS_L2_PL310) += cache-pl310.o
 SOBJS-$(CONFIG_USE_ARCH_MEMSET) += memset.o