SPL: NAND: Move arch/arm/cpu/armv7/omap-common/spl_nand.c to common/spl

We move the spl_nand_load_image function to common/spl.  This will allow
for easier integration of SPL-boots-Linux code on other arches.

Signed-off-by: Tom Rini <trini@ti.com>
diff --git a/common/spl/Makefile b/common/spl/Makefile
index b61b438..b9c9fd8 100644
--- a/common/spl/Makefile
+++ b/common/spl/Makefile
@@ -16,6 +16,7 @@
 ifdef CONFIG_SPL_BUILD
 COBJS-$(CONFIG_SPL_FRAMEWORK) += spl.o
 COBJS-$(CONFIG_SPL_YMODEM_SUPPORT) += spl_ymodem.o
+COBJS-$(CONFIG_SPL_NAND_SUPPORT) += spl_nand.o
 endif
 
 COBJS	:= $(sort $(COBJS-y))