bonescript: silence systemd bbclass WARNING, ${PN}-systemd is unwanted
bonescript: silence systemd bbclass WARNING, ${PN}-systemd is unwanted

Signed-off-by: Denys Dmytriyenko <d29de71aea38aad3a87d486929cb0aad173ae612@ti.com>

RedFIR/meta-ti,smoosvi/Test4,treideme/meta-ti-rt,rcn-ee/meta-ti,RedFIR/meta-ti,floft/meta-ti,rcn-ee/meta-ti,joelagnel/meta-ti,tylerwhall/meta-ti,smoosvi/Test4,tylerwhall/meta-ti,rvfh/meta-ti,joelagnel/meta-ti,treideme/meta-ti-rt,joelagnel/meta-ti,rcn-ee/meta-ti,tylerwhall/meta-ti,mrchapp/meta-ti-amsdk,jumpnow/meta-ti,jumpnow/meta-ti,joelagnel/meta-ti,floft/meta-ti,Angstrom-distribution/meta-ti,RedFIR/meta-ti,rvfh/meta-ti,RedFIR/meta-ti,Angstrom-distribution/meta-ti,mrchapp/meta-ti-amsdk,rcn-ee/meta-ti,rvfh/meta-ti,tylerwhall/meta-ti