scsi: ufs-qcom: fix the issue of get wrong ufs clk status from sysfs node

Currently we only set host->clks_on to TRUE when clock is enabled,
but don't set back to FALSE when clock is disabled. It would lead to
incorrect clk status user read from sysfs node. Fix it by setting
back to FALSE when clock is disabled in ufs_qcom_setup_clocks().

Change-Id: I3b76ead3dad860c1749585e9c20c31af54de3998
Signed-off-by: Jun Li <liju@codeaurora.org>