dom0: add spacing around DOM0_MAIN_PKGS
dom0: add spacing around DOM0_MAIN_PKGS

In some cases and ordering, bitbake will append the dependencies and
if we don't lead DOM0_MAIN_PKGS we'll end up with a concatenated
dependency that is unbuildable.

Signed-off-by: Bruce Ashfield <284cc737d174a260eec2a2a6324a304f84b1ae0f@windriver.com>

masselstine/meta-overc,WindRiver-OpenSourceLabs/meta-overc,mufeng/meta-overc,WindRiver-OpenSourceLabs/meta-overc,jwessel/meta-overc,OverC/meta-overc,OverC/meta-overc,paw3142/meta-overc-1,jwessel/meta-overc,masselstine/meta-overc,OverC/meta-overc,masselstine/meta-overc,OverC/meta-overc,WindRiver-OpenSourceLabs/meta-overc,mufeng/meta-overc,OverC/meta-overc,paw3142/meta-overc-1,jwessel/meta-overc,mufeng/meta-overc,masselstine/meta-overc,OverC/meta-overc