ARM: shmobile: r8a7779: I/O address abuse cleanup

a2a47ca3


(ARM: __io abuse cleanup) cleanuped __io() -> IOMEM(),
but setup-r8a7779.c was out of target,
since it directly used (void __iomem __force *) instead of __io().
This patch cleanup it.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Simon Horman <horms@verge.net.au>