v3d: remove redefine of VG(x)

Instead just depend on the one in v3d_packet_helpers.h
Reviewed-by: Eric Anholt <eric@anholt.net>
Part-of: <!5819>

src/gallium/drivers/v3d/v3d_bufmgr.c

@@ -35,14 +35,6 @@
 #include "v3d_context.h"
 #include "v3d_screen.h"
 
-#ifdef HAVE_VALGRIND
-#include <valgrind.h>
-#include <memcheck.h>
-#define VG(x) x
-#else
-#define VG(x)
-#endif
-
 static bool dump_stats = false;
 
 static void