radeonsi: mark MSAA config state as dirty at the beginning of CS

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=81020

Reviewed-by: Alex Deucher <alexander.deucher@amd.com>

src/gallium/drivers/radeonsi/si_hw_context.c

@@ -160,6 +160,7 @@ void si_begin_new_cs(struct si_context *ctx)
 	ctx->emitted.named.init = ctx->queued.named.init;
 
 	ctx->framebuffer.atom.dirty = true;
+	ctx->msaa_config.dirty = true;
 	ctx->b.streamout.enable_atom.dirty = true;
 	si_all_descriptors_begin_new_cs(ctx);