Input: touchscreen - use __maybe_unused instead of ifdef around suspend/resume

Use __maybe_unused instead of ifdef guards around suspend/resume
functions, in order to increase build coverage and fix build warnings.

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

diff --cc drivers/input/touchscreen/ad7877.c
Simple merge

diff --cc drivers/input/touchscreen/ad7879.c
Simple merge

diff --cc drivers/input/touchscreen/ads7846.c
Simple merge

diff --cc drivers/input/touchscreen/atmel_mxt_ts.c
Simple merge

diff --cc drivers/input/touchscreen/auo-pixcir-ts.c
Simple merge

diff --cc drivers/input/touchscreen/cy8ctmg110_ts.c
Simple merge

diff --cc drivers/input/touchscreen/cyttsp_core.c
Simple merge

diff --cc drivers/input/touchscreen/edt-ft5x06.c
Simple merge

diff --cc drivers/input/touchscreen/eeti_ts.c
Simple merge

diff --cc drivers/input/touchscreen/egalax_ts.c
Simple merge

diff --cc drivers/input/touchscreen/ili210x.c
Simple merge

diff --cc drivers/input/touchscreen/ipaq-micro-ts.c
Simple merge

diff --cc drivers/input/touchscreen/mms114.c
Simple merge

diff --cc drivers/input/touchscreen/pixcir_i2c_ts.c
Simple merge

diff --cc drivers/input/touchscreen/st1232.c
Simple merge

diff --cc drivers/input/touchscreen/tsc2005.c
Simple merge

diff --cc drivers/input/touchscreen/ucb1400_ts.c
Simple merge

diff --cc drivers/input/touchscreen/wacom_i2c.c
Simple merge

diff --cc drivers/input/touchscreen/zforce_ts.c
Simple merge