power: bcl_peripheral: Update the interrupt disable

Update the interrupt disable to be done as nosync.
This is to avoid any deadlock condition from a race
condition between the disable API and the interrupt
service routine.

CRs-Fixed: 821875
Change-Id: I45e4cd4607186cb6655cd24dfd36618a8f544739
Signed-off-by: Ram Chandrasekar <rkumbako@codeaurora.org>