usb: phy-msm-susb-qmp: Add checks to check clk_enabled

During dwc3 suspend clk_disable is directly getting
called without calling clk_enable in dwc3 resume
functionality for SS Phy. This fix add a check and
disables clock only if it is enabled.

Change-Id: Id4c4a71ca4e57274c0f09a83ce4d22fe13909cd1
Signed-off-by: Chetan C R <cravin@codeaurora.org>