input: ft5x06_ts: Add firmware upgrade support for ft6x06

Focaltech 6x06 controller series uses a different reset
register compared to earlier supported controllers. Use
appropriate reset registers based on controller's id.

This patch is propagated from 3.18 kernel
'commit 88dd4c27a3f6 ("input: ft5x06_ts: Add firmware
upgrade support for ft6x06")'

Change-Id: Ia72fa9c256f9e6e2db79388b0152f4d6724ec457
Signed-off-by: Mohan Pallaka <mpallaka@codeaurora.org>