radv: fix s/load/store/ copy-paste typo

Fixes: cdc6efdd ("radv: implement all depth/stencil resolve modes using graphics")
Signed-off-by: Eric Engestrom <eric.engestrom@intel.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
(cherry picked from commit 30f639c1)