input: touchscreen: Remove redundant code from Goodix driver

Remove code that reads firmware from the header file, since
we don't plan to support this feature.

CRs-fixed: 591376
Change-Id: I6c18e153ddf18667ca83d47df20c71bce6dbfa21
Signed-off-by: Himanshu Aggarwal <haggarwa@codeaurora.org>