mmc: msm_sdcc: Remove unnecessary include

This driver has no reason to include msm_iomap.h. Remove it so
that we can remove msm_iomap.h from include/mach in the near future.

Acked-by: Chris Ball <cjb@laptop.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: David Brown <davidb@codeaurora.org>