imx: move BOARD_SIZE_CHECK to main Makefile

We currently have duplicate definitions for BOARD_SIZE_CHECK in Makefile
and arch/arm/mach-imx/Makefile.

Move the board size check from arch/arm/mach-imx/Makefile to Makefile.

Depending on the value of CONFIG_BOARD_SIZE_LIMIT an error like an error
like the following is thrown:

u-boot-dtb.imx exceeds file size limit:
  limit:  503696 bytes
  actual: 509720 bytes
  excess: 6024 bytes
make: *** [Makefile:1051: u-boot-dtb.imx] Error 1

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Fabio Estevam <festevam@gmail.com>

Makefile

@@ -1094,6 +1094,7 @@ endif
 
 %.imx: %.bin
 	$(Q)$(MAKE) $(build)=arch/arm/mach-imx $@
+	$(BOARD_SIZE_CHECK)
 
 %.vyb: %.imx
 	$(Q)$(MAKE) $(build)=arch/arm/cpu/armv7/vf610 $@

arch/arm/mach-imx/Makefile

@@ -61,21 +61,6 @@ obj-$(CONFIG_CMD_HDMIDETECT) += cmd_hdmidet.o
 obj-$(CONFIG_CMD_DEKBLOB) += cmd_dek.o
 endif
 
-ifneq ($(CONFIG_BOARD_SIZE_LIMIT),)
-BOARD_SIZE_CHECK = \
-        @actual=`wc -c $@ | awk '{print $$1}'`; \
-        limit=`printf "%d" $(CONFIG_BOARD_SIZE_LIMIT)`; \
-        if test $$actual -gt $$limit; then \
-                echo "$@ exceeds file size limit:" >&2 ; \
-                echo "  limit:  $$limit bytes" >&2 ; \
-                echo "  actual: $$actual bytes" >&2 ; \
-                echo "  excess: $$((actual - limit)) bytes" >&2; \
-                exit 1; \
-        fi
-else
-BOARD_SIZE_CHECK =
-endif
-
 PLUGIN = board/$(BOARDDIR)/plugin
 
 ifeq ($(CONFIG_USE_IMXIMG_PLUGIN),y)
@@ -124,7 +109,6 @@ u-boot.imx: MKIMAGEOUTPUT = u-boot.imx.log
 
 u-boot.imx: u-boot.bin u-boot.cfgout $(PLUGIN).bin FORCE
 	$(call if_changed,mkimage)
-	$(BOARD_SIZE_CHECK)
 
 ifeq ($(CONFIG_OF_SEPARATE),y)
 MKIMAGEFLAGS_u-boot-dtb.imx = -n $(filter-out $(PLUGIN).bin $< $(PHONY),$^) \