images: use oe.utils.conditional
images: use oe.utils.conditional

Signed-off-by: Koen Kooi <d0a161424d033e19799f22c7b0d92266ac3a2161@linaro.org>

Angstrom-distribution/meta-angstrom,Angstrom-distribution/meta-angstrom,Angstrom-distribution/meta-angstrom,Angstrom-distribution/meta-angstrom