input: touchpanel: Add DT support for Goodix touchpanel driver

Add device tree parser to allow Goodix touchpanel driver to get
board dependent configuration from device tree.

  This patch is propagated from 3.4 kernel
    commit: 0c3a9e121cb001a4de9f6bc84df37065dcb999d6
    input: touchpanel: Add DT support for Goodix touchpanel driver

Change-Id: I702400140130fd3b673e0e13a8dbdb7060bba881
Signed-off-by: Bingzhe Cai <bingzhec@codeaurora.org>
Signed-off-by: Sudhakar Manapati <smanap@codeaurora.org>