drm/i915/selftests: Remove hardcoded value with a macro

Use MI_USE_GGTT instead of hardcoded value.
Signed-off-by: Nirmoy Das <nirmoy.das@intel.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Reviewed-by: Andrzej Hajda <andrzej.hajda@intel.com>
Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221213120010.5857-1-nirmoy.das@intel.com

drivers/gpu/drm/i915/gem/selftests/i915_gem_coherency.c

@@ -222,7 +222,7 @@ static int gpu_set(struct context *ctx, unsigned long offset, u32 v)
 	}
 
 	if (GRAPHICS_VER(ctx->engine->i915) >= 8) {
-		*cs++ = MI_STORE_DWORD_IMM_GEN4 | 1 << 22;
+		*cs++ = MI_STORE_DWORD_IMM_GEN4 | MI_USE_GGTT;
 		*cs++ = lower_32_bits(i915_ggtt_offset(vma) + offset);
 		*cs++ = upper_32_bits(i915_ggtt_offset(vma) + offset);
 		*cs++ = v;