next(fvp-next): add FIP build for post_tf_build

Change-Id: Ic5434ac90d53d94354c98a692f55ef831fa96af3
Signed-off-by: Tomás González <tomasagustin.gonzalezorlando@arm.com>
diff --git a/group/tf-next-build/fvp-next:nil b/group/tf-next-build/fvp-next:nil
index 1ca7bde..bdb903f 100644
--- a/group/tf-next-build/fvp-next:nil
+++ b/group/tf-next-build/fvp-next:nil
@@ -37,3 +37,7 @@
     export RUSTUP_HOME=/usr/local/rustup
     make PLAT=fvp -C "$tf_root/rust" clippy
 }
+
+post_tf_build() {
+	build_fip RUST=1 PLAT=fvp
+}