nyx-lib: Move runtime dependency to packagegroup

* nyx-lib is not MACHINE_ARCH, but nyx-modules are
* nyx-modules are not safe enough to exclude them with
  SIGGEN_EXCLUDERECIPES_ABISAFE
* instead of changing nyx-lib to be MACHINE_ARCH pull nyx-modules
  from MACHINE_ARCH packagegroup-webos-extended and remove nyx-lib
  RDEPENDS

Open-webOS-DCO-1.0-Signed-off-by: Martin Jansa <martin.jansa@lge.com>
Change-Id: Ie1303c320a7420158a200284549858516c447ca0
Reviewed-on: https://g2g.palm.com/1855
Reviewed-by: Build Verification
Reviewed-by: Martin Jansa <Martin.Jansa@lge.com>
Tested-by: Martin Jansa <Martin.Jansa@lge.com>
Reviewed-by: Susan Montooth <susan.montooth@lge.com>