limit igepv2 only to serial, my bad for not enough testing, maybe for the next release
limit igepv2 only to serial, my bad for not enough testing, maybe for the next release

Signed-off-by: Robert Nelson <d6c41255011d14bfa93d8562b946ca186cfa0c7b@gmail.com>

BrianAdams/omap-image-builder,beagleboard/image-builder,hankchan/bbb-image-builder,jlefley/omap-image-builder,OpenROV-forks/omap-image-builder,jadonk/image-builder,beagleboard/image-builder,eliasbakken/omap-image-builder,robert-budde/omap-image-builder,jadonk/image-builder,RobertCNelson/omap-image-builder,OpenROV-forks/omap-image-builder,gthrive/image-builder,eliasbakken/kamikaze,miloh/image-builder,robert-budde/omap-image-builder,miloh/image-builder,mhaberler/omap-image-builder,RobertCNelson/omap-image-builder