input: touchscreen: Add virtual key support from dtsi

Add virtual key support from device tree node and
corrected the sequence of virtual keys defined in
dtsi for Goodix driver.

CRs-fixed: 567499

This patch is propagated from msm-3.10 kernel.
(commit: 5ba42fbc2361865df5374d3306533d71c443fbb2
input: touchscreen: Add virtual key support from dtsi)

Change-Id: Iee1db2eb07c00fd4338255b9648fac5e05aa9c6d
Signed-off-by: Shantanu Jain <shjain@codeaurora.org>
Signed-off-by: Sudhakar Manapati <smanap@codeaurora.org>