arm: Don't include common.h in header files

It is bad practice to include common.h in other header files since it can
bring in any number of superfluous definitions. It implies that some C
files don't include it and thus may be missing CONFIG options that are set
up by that file. The C files should include these themselves.

Update some header files in arch/arm to drop this.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/arm/mach-omap2/omap5/sdram.c b/arch/arm/mach-omap2/omap5/sdram.c
index 6bf4cf4..786da45 100644
--- a/arch/arm/mach-omap2/omap5/sdram.c
+++ b/arch/arm/mach-omap2/omap5/sdram.c
@@ -10,6 +10,7 @@
  * Sricharan R <r.sricharan@ti.com>
  */
 
+#include <common.h>
 #include <asm/emif.h>
 #include <asm/arch/sys_proto.h>