imx: reorganize IMX code as other SOCs

Change is consistent with other SOCs and it is in preparation
for adding SOMs. SOC's related files are moved from cpu/ to
mach-imx/<SOC>.

This change is also coherent with the structure in kernel.

Signed-off-by: Stefano Babic <sbabic@denx.de>

CC: Fabio Estevam <fabio.estevam@nxp.com>
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Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com>
Reviewed-by: Christian Gmeiner <christian.gmeiner@gmail.com>
diff --git a/Makefile b/Makefile
index 4c4c8d8..4525964 100644
--- a/Makefile
+++ b/Makefile
@@ -899,7 +899,7 @@
 endif
 
 %.imx: %.bin
-	$(Q)$(MAKE) $(build)=arch/arm/imx-common $@
+	$(Q)$(MAKE) $(build)=arch/arm/mach-imx $@
 
 %.vyb: %.imx
 	$(Q)$(MAKE) $(build)=arch/arm/cpu/armv7/vf610 $@
@@ -1064,10 +1064,10 @@
 	$(call if_changed,pad_cat)
 
 SPL: spl/u-boot-spl.bin FORCE
-	$(Q)$(MAKE) $(build)=arch/arm/imx-common $@
+	$(Q)$(MAKE) $(build)=arch/arm/mach-imx $@
 
 u-boot-with-spl.imx u-boot-with-nand-spl.imx: SPL u-boot.bin FORCE
-	$(Q)$(MAKE) $(build)=arch/arm/imx-common $@
+	$(Q)$(MAKE) $(build)=arch/arm/mach-imx $@
 
 MKIMAGEFLAGS_u-boot.ubl = -n $(UBL_CONFIG) -T ublimage -e $(CONFIG_SYS_TEXT_BASE)