Input: tc3589x-keypad - fix section mismatch warning

Input: tc3589x-keypad - fix section mismatch warning

WARNING: drivers/input/keyboard/built-in.o(.text+0xb55b): Section mismatch in reference from the function tc3589x_keypad_open() to the function .devinit.text:tc3589x_keypad_init_key_hardware()
The function tc3589x_keypad_open() references
the function __devinit tc3589x_keypad_init_key_hardware().
This is often because tc3589x_keypad_open lacks a __devinit
annotation or the annotation of tc3589x_keypad_init_key_hardware is wrong.

Signed-off-by: Harvey Yang <harvey.huawei.yang@gmail.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>