msm: mpm-of: Fix incorrect setting of edge control

The edge control register was being set incorrectly assuming continuous
2 bit values in detect control register.Per the Hardware Programming
guide, two different registers are used to configure the rising/falling
properties of the interrupts.

CRs-fixed: 471545
Change-Id: I60036b34a41e560fe8ce38c563cd276ed5e2e080
Signed-off-by: Mahesh Sivasubramanian <msivasub@codeaurora.org>