Remove unneeded include paths in PLAT_INCLUDES

Also, update platform_def.h guidelines about includes in the porting
guide.

Change-Id: I1ae338c9dd3242b309f6d53687ba2cb755d488c3
Signed-off-by: Antonio Nino Diaz <antonio.ninodiaz@arm.com>
diff --git a/plat/marvell/a8k/common/ble/ble.mk b/plat/marvell/a8k/common/ble/ble.mk
index ed4ff3a..b24083f 100644
--- a/plat/marvell/a8k/common/ble/ble.mk
+++ b/plat/marvell/a8k/common/ble/ble.mk
@@ -17,11 +17,10 @@
 				$(PLAT_MARVELL)/common/plat_delay_timer.c	\
 				$(PLAT_MARVELL)/common/marvell_console.c
 
-PLAT_INCLUDES		+= 	-I$(MV_DDR_PATH) \
-				-I$(CURDIR)/include/ \
-				-I$(CURDIR)/include/lib \
-				-I$(CURDIR)/include/lib/libc \
-				-I$(CURDIR)/include/lib/libc/aarch64 \
+PLAT_INCLUDES		+= 	-I$(MV_DDR_PATH)				\
+				-I$(CURDIR)/include				\
+				-I$(CURDIR)/include/lib/libc			\
+				-I$(CURDIR)/include/lib/libc/aarch64		\
 				-I$(CURDIR)/drivers/marvell
 
 BLE_LINKERFILE		:=	$(BLE_PATH)/ble.ld.S