build: add build configs for infra-rd platforms in tftf

Add tftf build configs for the following infra-rd platforms:
* rdv1
* rdn2
* rdn2cfg1

Signed-off-by: Shriram K <shriram.k@arm.com>
Change-Id: I8d61a225fba20c5c3d9c914c22bf599ada100bd4
diff --git a/tftf_config/fvp-rdv1-default b/tftf_config/fvp-rdv1-default
new file mode 100644
index 0000000..51de4e1
--- /dev/null
+++ b/tftf_config/fvp-rdv1-default
@@ -0,0 +1,2 @@
+CROSS_COMPILE=aarch64-none-elf-
+PLAT=rdv1