clk: qcom: clock-local2: Add memory toggle support for branch clocks

Some branch clocks have memory associated to it. Add support for
turning on or off memory during clock enable and disable.

Change-Id: I0d31edbd1dbcecaaa4eebaf2c2469671f4bd3f67
Signed-off-by: Junjie Wu <junjiew@codeaurora.org>