Staging: ste_rmi4: Remove unnecessary MODULE_ALIAS()

The driver has a I2C device id table that is used to create the modaliases
which already contains "synaptics_rmi4_ts". So the alias is not needed.

Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>