This driver supports power button event in Intel Virtual Button currently.
New Dell XPS 13 requires this driver for the power button.

This driver is copied/modified from intel-hid.c
Most credit goes to the author of intel-hid.c,
Alex Hung <alex.hung@canonical.com>
Signed-off-by: NAceLan Kao <acelan.kao@canonical.com>
Signed-off-by: NDarren Hart <dvhart@linux.intel.com>