HID: remove use of DRIVER_LICENSE

Local "#define DRIVER_LICENSE" obfuscates which license is used
in MODULE_LICENSE().  "fgrep -R MODULE_LICENSE" is more informative
when the string is hard coded in MODULE_LICENSE.

Signed-off-by: Grant Grundler <grundler@google.com>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>