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/qemu/platform.mk b/plat/qemu/platform.mk
index 982886a..f086ddc 100644
--- a/plat/qemu/platform.mk
+++ b/plat/qemu/platform.mk
@@ -30,9 +30,7 @@
 endif
 
 PLAT_PATH               :=      plat/qemu/
-PLAT_INCLUDES		:=	-Iinclude/plat/arm/common/		\
-				-Iplat/qemu/include			\
-				-Iinclude/common/tbbr
+PLAT_INCLUDES		:=	-Iplat/qemu/include
 
 ifeq (${ARM_ARCH_MAJOR},8)
 PLAT_INCLUDES		+=	-Iinclude/plat/arm/common/${ARCH}
@@ -55,8 +53,6 @@
 				drivers/auth/img_parser_mod.c		\
 				drivers/auth/tbbr/tbbr_cot.c
 
-    PLAT_INCLUDES	+=	-Iinclude/bl1/tbbr
-
     BL1_SOURCES		+=	${AUTH_SOURCES}				\
 				bl1/tbbr/tbbr_img_desc.c		\
 				plat/common/tbbr/plat_tbbr.c		\