imx: Move some i.MX common functions into the imx-common directory

This patch moves the following functions into the imx-common
directory:

- mxs_wait_mask_set()
- mxs_wait_mask_clr()
- mxs_reset_block()

These are currently used by i.MX28. But the upcoming GPMI NAND port
for i.MX6 will also use these functions. So lets move them to a
common location to re-use them.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Marek Vasut <marex@denx.de>
Cc: Fabio Estevam <fabio.estevam@freescale.com>
diff --git a/spl/Makefile b/spl/Makefile
index b5a8de7..da2dd0a 100644
--- a/spl/Makefile
+++ b/spl/Makefile
@@ -94,6 +94,10 @@
 LIBS-y += $(CPUDIR)/tegra-common/libtegra-common.o
 endif
 
+ifneq ($(CONFIG_MX23),)
+LIBS-y += arch/$(ARCH)/imx-common/libimx-common.o
+endif
+
 # Add GCC lib
 ifeq ("$(USE_PRIVATE_LIBGCC)", "yes")
 PLATFORM_LIBGCC = $(SPLTREE)/arch/$(ARCH)/lib/libgcc.o