input: hbtp_input: Port and add snapshot of changes from msm-3.10

Port the HBTP Input driver and apply the following driver
changes taken from msm-3.10 kernel branch as of msm-3.10 commit.

31773451	input: misc: add input driver for HBTP

20bf9c5f	input: hbtp_input: bypass alphabetical and numeric
		key config

e424ee72	input: misc: hbtp-input: add event type in uevents

Change-Id: I122d22cf738c747bcd43ec7f90c33a239288fd9d
Signed-off-by: Jing Lin <jinglin@codeaurora.org>
Signed-off-by: Chun Zhang <chunz@codeaurora.org>
Signed-off-by: Himanshu Aggarwal <haggarwa@codeaurora.org>