When removing helm-toolkit from OSH and swithcing to use the
toolkit from OSH-Infra, the image declaration function was missed.
Depends-On: I2f2012590d81ffcb159d49d8a76eedd4441744cd
Change-Id: I0f1118bb748f3fe1b6bb73acfc00e77c5cca9c7d
Signed-off-by: Pete Birley <pete@port.direct>