manifest: Add legacy blobs remote

Used by the pa.dependencies fetch blobs for Legacy.

Change-Id: I71144c8c1f84051d35fbb00f1f86898e63ce8744
Signed-off-by: houst0nn <houstonn@gmail.com>
Track CM external_jpeg

Change-Id: I6738c920469c1062bd8521b7f32e0b66b8cb2a7a