msm: camera: icp: Add support for firmware hangdump

Created debugfs entry to support firmware hangdump with
three levels.
The three levels are to disable the dumping of data, to
enable the dump only during firmware failure and enable
dump for each frame.

For disabling:
adb shell echo 0 > /sys/kernel/debug/camera_icp/a5_fw_dump_lvl

For dump on failure:
adb shell echo 1 > /sys/kernel/debug/camera_icp/a5_fw_dump_lvl

For dump on each frame:
adb shell echo 2 > /sys/kernel/debug/camera_icp/a5_fw_dump_lvl

Change-Id: I2c6a2b92563196306bc2baded2d3316de054ecb2
Signed-off-by: Abhilash Kumar <krabhi@codeaurora.org>
Signed-off-by: Tony Lijo Jose <tjose@codeaurora.org>