drm/xe: Resume TDR after GT reset

Not starting the TDR after GT reset on exec queue which have been
restarted can lead to jobs being able to be run forever. Fix this by
restarting the TDR.

Fixes: dd08ebf6 ("drm/xe: Introduce a new DRM driver for Intel GPUs")
Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Nirmoy Das <nirmoy.das@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240724235919.1917216-1-matthew.brost@intel.com