msm: ais: Register and listen to bridge-chip interrupts

Changes that help facilitate sending the FPD-III to CSI bridge chip's
input signal status to the user-mode components.

Change-Id: I5e39c75b61f05edc8a1dc77677b9cad85fc563eb
Signed-off-by: Terence Ho <terenceh@codeaurora.org>
Signed-off-by: Andy Sun <bins@codeaurora.org>