clk: qcom: Add set_flags ops for the clk_gate2_ops

Gate clocks would also require to set the flags using
clk_set_flags. Add the clk_ops for the same.

Change-Id: I9d180e4aedb17692eb2e48f98461239d29bbf975
Signed-off-by: Amit Nischal <anischal@codeaurora.org>