etf3k: Increase touchscreen sensitivity

0xlab did similar for DevKit8000 here:
https://gitorious.org/0xlab-kernel/kernel/commit/f5a258642408fd7820d7aefc58d1eb3719e06b8a

Signed-off-by: Luis Cruz <ljc2491@gmail.com>
Merge pull request #1 from SyNtheticNightmar3/topic/ts-sensitivity

etf3k: Increase touchscreen sensitivity