soc: qcom: flush persistent kmaps and fixmap mappings for MBA

on 32 bit architecture xpu violations are happening because of mappings
in PK map regions. Flush the PKMAP and fixmap mappings to make sure that
there are no duplicate mappings for MBA regions. On 64 bit architecture
these functions turn out to be do while 0;

Change-Id: I9f5dc20c292688bf09d137ae7722820ae51a7d60
Signed-off-by: Arun KS <arunks@codeaurora.org>