sh: fix romImage mach dir usage

This patch moves all the romImage related header files into
the mach/ directory.
Signed-off-by: NMagnus Damm <damm@igel.co.jp>
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

arch/sh/boot/romimage/head.S

@@ -7,4 +7,4 @@
 .text
 	.global	romstart
 romstart:
-#include <romimage.h>
+#include <mach/romimage.h>