msm: camera: lrme: Fix the unpack config and add dump function

Fix unpack config in fetch engine and add dump function.
adb shell "echo 1 > /sys/kernel/debug/camera_lrme/dump_register"
to dump register when reg update irq is received.

Signed-off-by: Shubhraprakash Das <sadas@codeaurora.org>
Signed-off-by: Junzhe Zou <jnzhezou@codeaurora.org>
Change-Id: I9ff9843df6cb881a2a0080b852ae376d42a00ed0