ARM: shmobile: remove MMC_CAP2_NO_MULTI_READ from koelsch

sh_mobile_sdhi cares multiblock read bug.
remove MMC_CAP2_NO_MULTI_READ flag from board code

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Acked-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>