Input: atmel_mxt_ts: Fix error handling in mxt_probe

Fix out-of-order error handling of several error cases in mxt_probe.
Make sure allocated memory is freed in mxt_initialize when an error
occurs.

Change-Id: I4331a71263b62ff6bdeaafbe6881e591b09d2ffc
Signed-off-by: Jing Lin <jinglin@codeaurora.org>