mmc: block: Put card instead of release_host in mmc_ioctl

mmc_put_card API also takes care of runtime suspend/resume. Also, the
API mmc_blk_ioctl_cmd uses mmc_get_card. So, use mmc_put_card as this
will ensure the runtime counters are maintained when using the
MMC_IOCTL_CMD.

Change-Id: I74eacd0172c79eee299d672b7c63d3754a28ce61
Signed-off-by: Vijay Viswanath <vviswana@codeaurora.org>
Signed-off-by: Veerabhadrarao Badiganti <vbadigan@codeaurora.org>