msm: acpuclock-krait: Don't vote for PLL regulators in power-collapse paths

The HFPLL regulator votes are active-set-only votes. This allows
us to get away with not voting for the HFPLL regulators in the
power collapse path by allowing the sleep-set <-> active-set
transition in the RPM to take care of this for us. Thus:

1. In the power-collapse path, if a CPU or the L2 switches from
   an HFPLL source to a non HFPLL source, the regulator votes
   remain in place, but will be removed once apps transitions
   to its sleep set.
2. In the power-collapse path, if a CPU or the L2 switches from
   a non HFPLL source to a non HFPLL source, the regulator votes
   are already not present.
3. In the resume path, when apps transitions to its active set,
   the HFPLL regulators would be turned back on before the HFPLL
   source is reselected.

Change-Id: I208bdbe9ea38dd46d6380d20bf4a60c15da483e9
Signed-off-by: Vikram Mulukutla <markivx@codeaurora.org>