Makefile: remove extra include paths in INCLUDES

Now it is needed to use the full path of the common header files.

Commit 09d40e0e0828 ("Sanitise includes across codebase") provides more
information.

Change-Id: Ifedc79d9f664d208ba565f5736612a3edd94c647
Signed-off-by: Ambroise Vincent <ambroise.vincent@arm.com>
diff --git a/drivers/staging/renesas/rcar/pfc/V3M/pfc_init_v3m.c b/drivers/staging/renesas/rcar/pfc/V3M/pfc_init_v3m.c
index 37def9e..caa6048 100644
--- a/drivers/staging/renesas/rcar/pfc/V3M/pfc_init_v3m.c
+++ b/drivers/staging/renesas/rcar/pfc/V3M/pfc_init_v3m.c
@@ -6,7 +6,7 @@
  */
 
 #include <stdint.h>		/* for uint32_t */
-#include <mmio.h>
+#include <lib/mmio.h>
 #include "pfc_init_v3m.h"
 #include "include/rcar_def.h"
 #include "rcar_private.h"