Move genskel to af-binder-tools recipes

Move genskel to af-binder-tools recipes

This change fixes SPEC-941 and the HAL build by providing the needed
afb-genskel for build by recipe and as part of the SDK.

v2: move to af-binder folder and align naming to af-binder-devtools
    add nativesdk-af-binder-devtools to packagegroup nativesdk-packagegroup-sdk-host
    add af-binder-devtools-native to packagegroup packagegroup-agl-app-framework

v3: move af-binder-devtools-native to aglwgt as DEPENDS as there is no -native package
    to add to the packagegroup-agl-app-framework

Bug-AGL: SPEC-941

Change-Id: Iae3c8d958000623b1c84db896307032f5033477d
Signed-off-by: Jan-Simon Möller <jsmoeller@linuxfoundation.org>
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/12033
Tested-by: Jenkins Job builder account <agl-jobbuilder@automotivelinux.org>
ci-image-build: Jenkins Job builder account <agl-jobbuilder@automotivelinux.org>