drm: rename libdrm{,_macros}.h

Provide a more meaningful name, considering what it does.

Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>
diff --git a/radeon/radeon_cs_space.c b/radeon/radeon_cs_space.c
index cca650b..1a6ea28 100644
--- a/radeon/radeon_cs_space.c
+++ b/radeon/radeon_cs_space.c
@@ -31,7 +31,7 @@
 #include <assert.h>
 #include <errno.h>
 #include <stdlib.h>
-#include "libdrm.h"
+#include "libdrm_macros.h"
 #include "radeon_cs.h"
 #include "radeon_bo_int.h"
 #include "radeon_cs_int.h"