Input: sis-i2c - select CONFIG_CRC_ITU_T

The newly added sis_i2c driver fails to link without the CRC_ITU_T
driver enabled:

drivers/input/touchscreen/sis_i2c.o: In function `sis_ts_irq_handler':
sis_i2c.c:(.text+0xc0): undefined reference to `crc_itu_t'

This adds a Kconfig select statement.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Fixes: a485cb03 ("Input: add driver for SiS 9200 family I2C touchscreen controllers")
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/touchscreen/Kconfig

@@ -1074,6 +1074,7 @@ config TOUCHSCREEN_SILEAD
 config TOUCHSCREEN_SIS_I2C
 	tristate "SiS 9200 family I2C touchscreen"
 	depends on I2C
+	select CRC_ITU_T
 	depends on GPIOLIB || COMPILE_TEST
 	help
 	  This enables support for SiS 9200 family over I2C based touchscreens.