mmc: tmio: Configure HOST_MODE WMODE according to bus width

Set the HOST_MODE register WMODE bit according to the SDHI bus width,
that is 0 for 64bit bus and 1 for 16/32bit bus.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>