drm/xe/oa: Print hwe to OA unit mapping

Print hwe to OA unit mapping to dmesg, to help debug for current and new
platforms.

v2: Separate out xe_oa_print_gt_oa_units() (Umesh)

Signed-off-by: Ashutosh Dixit <ashutosh.dixit@intel.com>
Reviewed-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com>
Link: https://lore.kernel.org/r/20250606192618.4133817-3-ashutosh.dixit@intel.com