arm: msm8974: Driver to add support to disable debug image

On MSM8974, XPUs do not reset for non-watchdog resets when the
watchdog debug feature is enabled. This driver is required to
provide an interface to disable debug image for a PS HOLD reset.

Change-Id: I9e4a210475d0fff686d9d88000e8d71da1b553a1
Signed-off-by: Pushkar Joshi <pushkarj@codeaurora.org>