Input: atmel_mxt_ts - simplify mxt_initialize a bit

I think having control flow with 2 goto/labels/flags is quite hard to read,
this version is a bit more readable IMO.

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Nick Dyer <nick.dyer@itdev.co.uk>