ARM: shmobile: Move dma-register.h

Change location of dma-register.h so it can be used as #include
"dma-register.h" instead of the old style #include <mach/dma-register.h>.

Signed-off-by: Magnus Damm <damm+renesas@opensource.se>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>