replace imports memory functions with utils memory functions

Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Reviewed-by: Kristian H. Kristensen <hoegsberg@google.com>
Reviewed-by: Matt Turner <mattst88@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/3024>

src/mesa/state_tracker/st_extensions.c

@@ -39,6 +39,7 @@
 #include "pipe/p_screen.h"
 #include "tgsi/tgsi_from_mesa.h"
 #include "util/u_math.h"
+#include "util/u_memory.h"
 
 #include "st_context.h"
 #include "st_debug.h"