common: arm: freescale: layerscape: Move header files out of common.h

We should not have an arch-specific header file in common.h. Adjust the
board files a little so it is not needed, and drop it.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/include/fsl_ifc.h b/include/fsl_ifc.h
index a86f216..29aa687 100644
--- a/include/fsl_ifc.h
+++ b/include/fsl_ifc.h
@@ -11,6 +11,9 @@
 #ifdef CONFIG_FSL_IFC
 #include <config.h>
 #include <common.h>
+#ifdef CONFIG_ARM
+#include <asm/arch/soc.h>
+#endif
 
 #define FSL_IFC_V1_1_0	0x01010000
 #define FSL_IFC_V2_0_0	0x02000000