mmc: fix the wrong disabling clock

mmc: fix the wrong disabling clock

When power is off, clock is not disabling.
Because it's passed to 1, mmc->clock should be set to f_min value.
Some drivers can't initialize the eMMC/SD card with current status.

This patch is to fix the disabling clock value to 0.

Fixes: 2e7410d76ad1 ("mmc: disable the mmc clock during power off")
Signed-off-by: Jaehoon Chung <[email protected]>
Reviewed-by: Jean-Jacques Hiblot <[email protected]>
Tested-by: Guillaume GARDET <[email protected]>
Tested-by: Anand Moon <[email protected]>