af-main: Install debugging features when agl-devel

af-main: Install debugging features when agl-devel

When agl-devel is required, installs the debugging
feature needed by XDS.

Also, improves AGL_DEVEL setting of af-binder.

Bug-AGL: SPEC-659

Change-Id: I90a1ecbaf78b860ded4f3a70d81ab6312d40772e
Signed-off-by: José Bollo <jose.bollo@iot.bzh>
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/10333
Tested-by: Jenkins Job builder account <agl-jobbuilder@automotivelinux.org>
ci-image-build: Jenkins Job builder account <agl-jobbuilder@automotivelinux.org>
Reviewed-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>