mmc: mmc: Add clk_hold/release pair before caching host->ios

We need to add mmc_host_clk_hold/release pair before caching
host->ios. Since it may so happen that the clks are gated
while caching and thus in next CMD5 awake, changing clk back to
cached_ios->clk might give NOC error.

Change-Id: I32b8c1bbbd67b4daadaa85c3c01beab8ff1b7cb2
Signed-off-by: Ritesh Harjani <riteshh@codeaurora.org>