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/common/drivers/flowctrl/flowctrl.c b/plat/nvidia/tegra/common/drivers/flowctrl/flowctrl.c
index bdd3ee7..8f55554 100644
--- a/plat/nvidia/tegra/common/drivers/flowctrl/flowctrl.c
+++ b/plat/nvidia/tegra/common/drivers/flowctrl/flowctrl.c
@@ -13,9 +13,9 @@
 #include <lib/mmio.h>
 
 #include <flowctrl.h>
+#include <lib/utils_def.h>
 #include <pmc.h>
 #include <tegra_def.h>
-#include <utils_def.h>
 
 #define CLK_RST_DEV_L_SET		0x300
 #define CLK_RST_DEV_L_CLR		0x304