fconf: Move platform io policies into fconf

Use the firmware configuration framework to store the io_policies
information inside the configuration device tree instead of the static
structure in the code base.

The io_policies required by BL1 can't be inside the dtb, as this one is
loaded by BL1, and only available at BL2.

This change currently only applies to FVP platform.

Change-Id: Ic9c1ac3931a4a136aa36f7f58f66d3764c1bfca1
Signed-off-by: Louis Mayencourt <louis.mayencourt@arm.com>
diff --git a/make_helpers/defaults.mk b/make_helpers/defaults.mk
index fff336c..e8e990d 100644
--- a/make_helpers/defaults.mk
+++ b/make_helpers/defaults.mk
@@ -201,6 +201,9 @@
 # Build option to add debugfs support
 USE_DEBUGFS			:= 0
 
+# Build option to fconf based io
+USE_FCONF_BASED_IO		:= 0
+
 # Build option to choose whether Trusted Firmware uses library at ROM
 USE_ROMLIB			:= 0