yocto-builder: enable doc-pkgs in IMAGE_FEATURES
yocto-builder: enable doc-pkgs in IMAGE_FEATURES

Signed-off-by: Paul Gortmaker <ae947f3c8df96e1dc851c5e3e5a930ce6d3f1f74@windriver.com>

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