clk: qcom: Add support for gate clocks

Add gate clocks support where the clocks could be
 - Either a branch clock with no branch halt check during
   enable/disable.
 - Clocks which have just enable/disable bit.

Change-Id: Ia3adcab26f54a4b34a08fec031be5dfb029376c2
Signed-off-by: Odelu Kukatla <okukatla@codeaurora.org>