The USB HID driver had some static variables with keyboard state. This moves them to the driver's instance, so multiple attached keyboards don't effect each other. Change-Id: I3f1ccfdea95062b443cebe510abf2f72fdeb1916 Signed-off-by: Nico Huber <nico.huber@secunet.com> Reviewed-on: http://review.coreboot.org/1907 Reviewed-by: Patrick Georgi <patrick@georgi-clan.de> Tested-by: build bot (Jenkins)