ci: test the new rot dev keys

Use the 3k and 4k dev rot keys for some configs,
Create a configuration that supports both build and test
for an ECDSA SWD RoT key.

Signed-off-by: Ryan Everett <ryan.everett@arm.com>
Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>
Change-Id: I93a20da0e08fce356411ddc04494e62db9d8fb47
diff --git a/tf_config/fvp-tbb-mbedtls-rsa-3k-cert-cc b/tf_config/fvp-tbb-mbedtls-rsa-3k-cert-cc
index 05614f8..1dfc1c2 100644
--- a/tf_config/fvp-tbb-mbedtls-rsa-3k-cert-cc
+++ b/tf_config/fvp-tbb-mbedtls-rsa-3k-cert-cc
@@ -6,6 +6,6 @@
 KEY_SIZE=3072
 LOG_LEVEL=20
 PLAT=fvp
-ROT_KEY=plat/arm/board/common/rotpk/arm_rotprivk_rsa.pem
+ROT_KEY=plat/arm/board/common/rotpk/arm_rotprivk_rsa_3k.pem
 TRUSTED_BOARD_BOOT=1
 ENABLE_ASSERTIONS=0