mmc: block: fix cmdq shutdown flow

This change fixes cmdq shutdown flow:
- claims host (since devfreq scaling context could race)
- holds clocks
- disables cmdq controller mode
- updates cmdq card state mode

Change-Id: Ie25664516f782812fe39fba574be50e44ece815c
Signed-off-by: Konstantin Dorfman <kdorfman@codeaurora.org>