tc: Update rse_revision to 2fe1f7e for TC3

Upgrade the rse_revision to use more recent pre-built RSE
firmware images. Use ECDSA signatures instead of RSA, these
images are verified in the BL2 stage of RSE (ECDSA became the
default signature algorithm for RSE in TF-M).

Change-Id: I6eb24bdb74ea66f537c7b87e932d1bc0e43e5ed8
Signed-off-by: David Vincze <david.vincze@arm.com>
diff --git a/tc_utils.sh b/tc_utils.sh
index a310f80..b5441bc 100644
--- a/tc_utils.sh
+++ b/tc_utils.sh
@@ -28,7 +28,7 @@
 if [ $plat_variant -eq 2 ]; then
 	rse_revision="4ab7a20d"
 elif [ $plat_variant -eq 3 ]; then
-	rse_revision="cd8ece72a"
+	rse_revision="2fe1f7e"
 elif [ $plat_variant -eq 4 ]; then
 	rse_revision="213c553bf"
 fi