mmc: sdhi: tidyup sh_mobile_sdhi_of_match position

It is easier to read if sh_mobile_sdhi_of_cfg and
sh_mobile_sdhi_of_match are closer.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Acked-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Chris Ball <chris@printf.net>