driver/touchpad_st: Add enable flag to config.h
This flag is used to enable the driver in driver/build.mk, but wasn't
documented in config.h yet.
TEST=`make buildall -j`
BRANCH=none
/*****************************************************************************/
/* Touchpad config */
-/* Enable touchpad, you must pick a driver (currently, only Elan exists) */
+/* Enable touchpad. (You must pick a driver from the options below.) */
#undef CONFIG_TOUCHPAD
/* Enable Elan driver */
#undef CONFIG_TOUCHPAD_ELAN
+/* Enable ST driver */
+#undef CONFIG_TOUCHPAD_ST
+
/* Set I2C port and address (7-bit) */
#undef CONFIG_TOUCHPAD_I2C_PORT
#undef CONFIG_TOUCHPAD_I2C_ADDR_FLAGS
