chore(2.8): add missing configs to set build flag to 0

Some configs were missed as a part of this patch:cff2427
added them now to resolve the L1 job failures.

Change-Id: I54719f86570b1b95e11c9cce5a7f38c9409bdcad
Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>
diff --git a/tf_config/fvp-pie-aarch64-only b/tf_config/fvp-pie-aarch64-only
new file mode 100644
index 0000000..30623ae
--- /dev/null
+++ b/tf_config/fvp-pie-aarch64-only
@@ -0,0 +1,4 @@
+CROSS_COMPILE=aarch64-none-elf-
+CTX_INCLUDE_AARCH32_REGS=0
+PLAT=fvp
+ENABLE_PIE=1