kernel-resin.bbclass: Add mandatory and optional kernel configs
kernel-resin.bbclass: Add mandatory and optional kernel configs

Signed-off-by: Jon Grisky <44f878afe53efc66b76772bd845eb65944ed8232@resin.io>

resin-os/meta-resin,resin-os/meta-resin,resin-os/meta-resin,resin-os/meta-resin