drm/i915/gt: Return bool values from a boolean helper

drm/i915/gt: Return bool values from a boolean helper

intel_has_gpu_reset() returns logically correct values by
returning a function pointer when GPU reset is supported and
NULL otherwise. However, as a boolean helper, it is more
appropriate to return explicit true or false values.

Signed-off-by: Andi Shyti <andi.shyti@linux.intel.com>
Reviewed-by: Sebastian Brzezinka <sebastian.brzezinka@intel.com>
Reviewed-by: Raag Jadav <raag.jadav@intel.com>
Link: https://lore.kernel.org/r/20260626215232.861416-1-andi.shyti@linux.intel.com