ARM: OMAP2+ Move SoC specific headers to be local to mach-omap2

These can now be moved to be local headers in mach-omap2.

Note that this patch removes arch/arm/plat-omap/devices.c as it
will get removed anyways with Paul Walmsley's patch
"ARM: OMAP: split OMAP1, OMAP2+ RNG device registration".

Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/mach-omap2/sleep24xx.S

@@ -28,8 +28,7 @@
 #include <linux/linkage.h>
 #include <asm/assembler.h>
 
-#include <plat/omap24xx.h>
-
+#include "omap24xx.h"
 #include "sdrc.h"
 
 /* First address of reserved address space?  apparently valid for OMAP2 & 3 */