drm/radeon/kms: add connector table for mac g5 9600

PPC Mac cards do not provide connector tables in
their vbios.  Their connector/encoder configurations
must be hardcoded in the driver.

verified by nyef on #radeon

Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Cc: stable@kernel.org
Signed-off-by: Dave Airlie <airlied@redhat.com>