radeonsi: remove unnecessary #includes

Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>
Reviewed-by: Edward O'Callaghan <funfunctor@folklore1984.net>

src/gallium/drivers/radeonsi/si_debug.c

@@ -25,7 +25,6 @@
  */
 
 #include "si_pipe.h"
-#include "si_shader.h"
 #include "sid.h"
 #include "sid_tables.h"
 #include "radeon/radeon_elf_util.h"