Input: ads7846 - cleanup GPIO initialization
Input: ads7846 - cleanup GPIO initialization

Use gpio_request_one() instead of multiple gpiolib calls.
This also simplifies error handling a bit.

Signed-off-by: Igor Grinberg <9e6f8d6081ce24a2c1d8f777071cb7290aaf46a3@compulab.co.il>
Signed-off-by: Dmitry Torokhov <10a8c465cefc9bdd6c925e26964d23c90f1141cc@mail.ru>

TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs