default: Add Focal repos to the manifest

Change-Id: I5fa821d8541d10a553a0df94fe49dd18f24f8c0b
Merge remote-tracking branch 'upstream/cm-10.2' into cm-10.2

Conflicts:
	default.xml

Change-Id: Iebb0d210549e6ca497965f0712c31829dcc0e3c0