soc: qcom: Add support PFE WA

Sometimes the PFTLB entries get stuck in the invalid state
and new prefetches get dropped. As a workaround,
when a large number of L1 prefetches have been dropped,
above a threshold, the PMU can generate an interrupt.
And then reset PFE. The default threshold is 257.

Change-Id: Id6142037fa411575c3cbaa30dd08140ab6e5cb3f
Signed-off-by: Se Wang (Patrick) Oh <sewango@codeaurora.org>