clk: qcom: clock-local2: Add set flag ops for gate clock

In some use case, clients want to do clk_set_flags using the
gate clock. Therefore, support this case by adding set_flags
to clk_gate_ops.

Change-Id: I626d1ca307417555e0324e2505a247c3c0878b5e
Signed-off-by: Arun KS <arunks@codeaurora.org>
Signed-off-by: Sridhar Gujje <sgujje@codeaurora.org>
Signed-off-by: Bharat Pawar <bpawar@codeaurora.org>
Signed-off-by: Nirmal Abraham <nabrah@codeaurora.org>