clk: qcom: common: Add set_flags op in clk_regmap_ops

Add set_flags op in clk_regmap_ops and update the
set_flags op for branch's clk_regmap_ops.
Update qcom_clk_set_flags to use clk_regmap_ops
for invoking the set_flags op.

Change-Id: I82b699e04854e5d9dcc0e82caccf33fe3dd85315
Signed-off-by: Veera Vegivada <vvegivad@codeaurora.org>