ARM: shmobile: kzm9g: bugfix: correct mmcif interrupt settings

Correct interrupt settings of sh_mmc:int and sh_mmc:error in board-kzm9g.c.

Signed-off-by: Tetsuyuki Kobayashi <koba@kmckk.co.jp>
Acked-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Simon Horman <horms@verge.net.au>