mfd: Update mpm to monitor pm8821 gpio line

PM8821_SEC_N_IRQ on 8064 is being routed as
a direct connect interrupt to QGIC. Change
this to enable mpm to monitor this interrupt
and wake it out of power collapse.This helps
in achieving vdd minimization on 8064.

Change-Id: Ia5c0463dc7c853f44d5d63a737aff10b15cf4a32
Signed-off-by: Chandra Ramachandran <cramacha@codeaurora.org>