drm/xe: Increase TDF timeout

drm/xe: Increase TDF timeout

There are some corner cases where flushing transient
data may take slightly longer than the 150us timeout
we currently allow.  Update the driver to use a 300us
timeout instead based on the latest guidance from
the hardware team. An update to the bspec to formally
document this is expected to arrive soon.

Fixes: c01c6066e6fa ("drm/xe/device: implement transient flush")
Signed-off-by: Jagmeet Randhawa <jagmeet.randhawa@intel.com>
Reviewed-by: Jonathan Cavitt <jonathan.cavitt@intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Link: https://patch.msgid.link/0201b1d6ec64d3651fcbff1ea21026efa915126a.1765487866.git.jagmeet.randhawa@intel.com
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>