drivers: lpm-workarounds: Enable L1/L2 clock gating WA

L1/L2 dynamic clock gating feature gates the L1/L2 clock
automatically which saves dynamic power. Core and L2 should be
quiescent state while enabling L1/L2 clock gating, hence early boot
code can't enable this for perf core0 and L2.
Implement a WA which will get called when perf cluster is in
low power mode to enable L1/L2 clock gating for perf core0 and L2.

Change-Id: Ia268d90a306770a4089370f83e3c9101c2661f1c
Signed-off-by: Anji Jonnala <anjir@codeaurora.org>
Signed-off-by: Sridhar Gujje <sgujje@codeaurora.org>
Signed-off-by: Bharat Pawar <bpawar@codeaurora.org>
Signed-off-by: Nirmal Abraham <nabrah@codeaurora.org>