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/plat/nvidia/tegra/include/drivers/memctrl_v2.h b/plat/nvidia/tegra/include/drivers/memctrl_v2.h
index f5b0ed4..9cbadd3 100644
--- a/plat/nvidia/tegra/include/drivers/memctrl_v2.h
+++ b/plat/nvidia/tegra/include/drivers/memctrl_v2.h
@@ -11,7 +11,7 @@
 
 #ifndef __ASSEMBLY__
 
-#include <mmio.h>
+#include <lib/mmio.h>
 #include <stdint.h>
 
 /*******************************************************************************