mmc: mmc_ops: Add retry mechanism to mmc_switch

Some devices do not honor the max switch timeout exposed via
ext_csd, they take longer than that to complete the switch.
Hence add a retry mechanism to wait longer for the card to
get out of programming state before timing out.

Change-Id: Ica46e30df24b4f95f457271087e1e03823ed2959
Signed-off-by: Venkat Gopalakrishnan <venkatg@codeaurora.org>