Input: qt2160 - rename kconfig symbol name

drivers/input/keyboard/Kconfig defines QT2160 while the corresponding
Makefile expects CONFIG_KEYBOARD_QT2160 as all other keyboard drivers
do. To keep this Makefile consistent rename the config-token from
CONFIG_QT2160 to CONFIG_KEYBOARD_QT2160.

The various defconfig files are left alone.

Reported-by: Robert P. J. Day <[e-mail]>
Signed-off-by: Christoph Fritz <[e-mail]>
Signed-off-by: Dmitry Torokhov <[e-mail]>

drivers/input/keyboard/Kconfig

···
 	  right-hand column will be interpreted as the key shown in the
 	  left-hand column.
 
-config QT2160
+config KEYBOARD_QT2160
 	tristate "Atmel AT42QT2160 Touch Sensor Chip"
 	depends on I2C && EXPERIMENTAL
 	help