rnoland ae1f87d8c5 Fix error in busmaster enable logic
rs400/rs480 should clear the RADEON_BUS_MASTER_DIS bit.  This should get
the rs485 IGP chips going again.

Approved by:	jhb (mentor)
Obtained from:	drm git master
2008-10-27 21:24:34 +00:00
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