msm: clock-generic: Move mux_reg_ops to clock-local2

To keep clock-generic generic, move the mux_reg_ops to
clock-local2, since clock-generic is really not meant
to touch hardware directly.

Change-Id: I4edf1c0c4af767844c1fe6b38642e2af39b98a7f
Signed-off-by: Vikram Mulukutla <markivx@codeaurora.org>