msm: clock-krait: Always configure low performance level krait clock tree

With newer HW versions, switching between BHS and LDO power supplies also
switches the CPU between the high performance clock tree output and low
performance clock tree output respectively.

Since the low performance clock tree is never configured (since it was
never used before), with newer HW versions running the CPU off the LDO
supply would also run the CPU at an unknown frequency that could be higher
that the max frequency for that specific voltage/current level.

Fix this by always configuring the high performance clock tree and the low
performance clock tree to the same frequency. This change is also
compatible with HW versions that don't have a low performance clock tree
since the register bits that correspond to the low performance clock tree
are marked as unused/reserved.

Change-Id: Ie82bf735220619be7ffd496cbd8b017c89904b41
Signed-off-by: Saravana Kannan <skannan@codeaurora.org>