drm/i915/migrate: fix offset calculation

drm/i915/migrate: fix offset calculation

[ Upstream commit 08c7c122ad90799cc3ae674e7f29f236f91063ce ]

Ensure we add the engine base only after we calculate the qword offset
into the PTE window.

Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Cc: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Cc: Ramalingam C <ramalingam.c@intel.com>
Reviewed-by: Ramalingam C <ramalingam.c@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211206112539.3149779-2-matthew.auld@intel.com
Signed-off-by: Sasha Levin <sashal@kernel.org>