ARM: shmobile: Move r8a7779.h

Change location of r8a7779.h so it can be included as "r8a7779.h"
instead of the old style <mach/r8a7779.h>

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>