msm: clock-8960: Enable PLL8 after set it to fsm mode for 8064

PLL8 might be off when acpuclock running off it during bootup.
Therefore, vote to enable it after setting it to fsm mode to
ensure it is on during clock init. The voting is done on behalf
of RPM since no client from RPM should vote this PLL off so we
have PLL8 always on. These changes will not be needed if boot
chain is in place and configure it correctly in future.

Change-Id: I07fdcabcc8684670f9a9eb54e5851871a516f93e
Signed-off-by: Tianyi Gou <tgou@codeaurora.org>