Input: pxa27x-keypad - use matrix_keymap for matrix keys

pxa27x-keypad includes matrix keys. Make use of matrix_keymap
for the matrix keys.

Signed-off-by: Chao Xie <chao.xie@marvell.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Input: pxa27x-keypad - add device tree support

Signed-off-by: Chao Xie <chao.xie@marvell.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Input: pxa27x-keypad - convert to using SIMPLE_DEV_PM_OPS

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Input: pxa27x-keypad - make platform data const

It should not be changed by the driver, so let's make it const pointer.

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>