arch/arm/include/asm/sizes.h: cleanups

Merge several sizes.h in asm/arch subdirectories into a single
asm/sizes.h file.

Fixup usage of asm/arch/sizes.h in some files to use the merged file.

Signed-off-by: Andreas Bießmann <andreas.devel@googlemail.com>
diff --git a/arch/arm/include/asm/arch-omap24xx/omap2420.h b/arch/arm/include/asm/arch-omap24xx/omap2420.h
index 0c11bec..6032419 100644
--- a/arch/arm/include/asm/arch-omap24xx/omap2420.h
+++ b/arch/arm/include/asm/arch-omap24xx/omap2420.h
@@ -25,7 +25,7 @@
 #ifndef _OMAP2420_SYS_H_
 #define _OMAP2420_SYS_H_
 
-#include <asm/arch/sizes.h>
+#include <asm/sizes.h>
 
 /*
  * 2420 specific Section