msm: camera: isp: Add api to mask the interrupts

It adds api to clear and mask all the interrupts for a irq
chip.

Change-Id: Ie205029809b1018ec9e7aa33661a53d8abb580f9
Signed-off-by: Alok Pandey <akumarpa@codeaurora.org>
Signed-off-by: Abhilash Kumar <krabhi@codeaurora.org>