vrend: partial revert to fix bgra sampling regression

Backtracks on one change from commit 5304e7d3 ("vrend: add
vrend_resource_needs_redblue_swizzle() to fix arcvm deqp"), that
incorrectly inverted the behavior for setting swizzle parameters for a
sampler of eglimage-backed bgra resources.

Fixes: 5304e7d3 ("vrend: add vrend_resource_needs_redblue_swizzle() to fix arcvm deqp")
Signed-off-by: Ryan Neph <ryanneph@google.com>
Part-of: <https://gitlab.freedesktop.org/virgl/virglrenderer/-/merge_requests/755>

src/vrend_renderer.c

@@ -2370,7 +2370,8 @@ int vrend_create_sampler_view(struct vrend_context *ctx,
          * back, and still benefit from automatic srgb decoding.
          * If the red/blue swap is intended, we just let it happen and don't
          * need to explicit change to the sampler's swizzle parameters. */
-        if (vrend_resource_needs_redblue_swizzle(view->texture, view->format)) {
+        if (!vrend_resource_supports_view(view->texture, view->format) &&
+            vrend_format_is_bgra(view->format)) {
               VREND_DEBUG(dbg_tex, ctx, "texture view with red/blue swizzle created for EGL-backed texture sampler"
                           " (format: %s; view: %s)\n",
                           util_format_name(view->texture->base.format),