drm/xe/pf: Use div_u64 when calculating GGTT profile

This will fix the following error seen on some 32-bit config:

"ERROR: modpost: "__udivdi3" [drivers/gpu/drm/xe/xe.ko] undefined!"

Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202511150929.3vUi6PEJ-lkp@intel.com/
Fixes: e448372 ("drm/xe/pf: Use migration-friendly GGTT auto-provisioning")
Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Reviewed-by: Piotr Piórkowski <piotr.piorkowski@intel.com>
Link: https://patch.msgid.link/20251115151323.10828-1-michal.wajdeczko@intel.com
(cherry picked from commit 0f4435a)
Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>

Author: mwajdecz

drivers/gpu/drm/xe/xe_gt_sriov_pf_config.c

@@ -711,7 +711,7 @@ static u64 pf_profile_fair_ggtt(struct xe_gt *gt, unsigned int num_vfs)
 	if (num_vfs > 56)
 		return SZ_64M - SZ_8M;
 
-	return rounddown_pow_of_two(shareable / num_vfs);
+	return rounddown_pow_of_two(div_u64(shareable, num_vfs));
 }
 
 /**