input: synaptics_i2c_rmi4: Register for FB events

Register to receive FB notifications and do suspend
when the display goes off and resume when it turns
back on.

CRs-fixed: 473492

This patch is propagated from msm-3.4 kernel.
(commit: f46540d0e067794291d53c3bfd9af7c6d224eed3
input: synaptics_i2c_rmi4: Register for FB events)
Also cleaned checkpatch errors on msm-3.18 kernel.

Change-Id: I5ad02a7080225b724deae06d5443e0f9f8fd6929
Signed-off-by: Amy Maloche <amaloche@codeaurora.org>
Signed-off-by: Sudhakar Manapati <smanap@codeaurora.org>