readme: update repo download url

Change-Id: Ia8d100da97b1d7a3735dfc3f147fe2357893b756
Track our own Dialer stuff

Change-Id: I38489c914efb6cac03e34b68763aefe34a35cfb6
manifest: remove device specific repos

Handle them through roomservice

Change-Id: Iaf8060d13339e8064b5383505c00a72816445f1d
Track CM for hardware/qcom/media

Change-Id: I7e705960a8678f84dafd955281bf04857bf824f3
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