clk: msm: clock: Add support for early boot frequency for MSM8996

Power and perf clusters early boot up frequencies require to be
updated to maximum frequnecy of NOM voltage corner to improve
the boot up time, so add support for the same.

Change-Id: Icf54a648f47765867812edc5a68cf52b7fd58fdd
Signed-off-by: Odelu Kukatla <okukatla@codeaurora.org>