drivers: soc: qti: Add support for fingerprint driver

Port qbt_handler from msm-4.19 branch upto commit
f5526dd3667d (qbt: Make IPC irq falling edge triggered).

Change-Id: I5adb23732850e56bfce0af89b378bf0bc0e4c192
Signed-off-by: Abir Ghosh <abirg@codeaurora.org>