imximage.cfg: run files through C preprocessor

The '#' used as comments in the files cause the preprocessor
trouble, so change to /* */.

The mkimage command which uses this preprocessor output
was moved to arch/arm/imx-common/Makefile

.gitignore was updated to ignore .cfgtmp files.

Signed-off-by: Troy Kisky <troy.kisky@boundarydevices.com>
diff --git a/arch/arm/imx-common/Makefile b/arch/arm/imx-common/Makefile
index b3e608e..6309fcd 100644
--- a/arch/arm/imx-common/Makefile
+++ b/arch/arm/imx-common/Makefile
@@ -42,6 +42,19 @@
 $(LIB):	$(OBJS)
 	$(call cmd_link_o_target, $(OBJS))
 
+$(OBJTREE)/$(patsubst "%",%,$(CONFIG_IMX_CONFIG)).cfgtmp: $(OBJTREE)/%.cfgtmp : $(SRCTREE)/%
+	mkdir -p $(dir $@)
+	$(CC) -E -x c $< $(CPPFLAGS) -o $@
+
+$(OBJTREE)/u-boot.imx: $(OBJTREE)/u-boot.bin $(OBJTREE)/$(patsubst "%",%,$(CONFIG_IMX_CONFIG)).cfgtmp
+	$(OBJTREE)/tools/mkimage -n $(filter-out %.bin,$^) -T imximage \
+	-e $(CONFIG_SYS_TEXT_BASE) -d $< $@
+
+$(OBJTREE)/SPL: $(OBJTREE)/spl/u-boot-spl.bin $(OBJTREE)/$(patsubst "%",%,$(CONFIG_IMX_CONFIG)).cfgtmp
+	$(OBJTREE)/tools/mkimage -n $(filter-out %.bin,$^) -T imximage \
+	-e $(CONFIG_SPL_TEXT_BASE) -d $< $@
+
+
 #########################################################################
 
 # defines $(obj).depend target