tc: Update scp_revision to ac2b4f1 for TC3

The SCP BL1 image is a pre-built, signed image for the
tests on the TC platform. Also use the corresponding
pre-built SCP BL2 image in the tests.

Change-Id: Ia85f94ddfd0134179ff170a53794d7b8514556bf
Signed-off-by: David Vincze <david.vincze@arm.com>
diff --git a/run_config/fvp-tc.spm.tftf b/run_config/fvp-tc.spm.tftf
index 4d524a2..803bbdb 100644
--- a/run_config/fvp-tc.spm.tftf
+++ b/run_config/fvp-tc.spm.tftf
@@ -8,15 +8,17 @@
 source "$ci_root/run_config/tc_rse_utils.sh"
 
 post_tf_build() {
-    if [ ! -f "$archive/scp_ram.bin" ]; then
-        if [ $plat_variant -eq 2 ] || [ $plat_variant -eq 3 ]; then
-            if [ $plat_variant -eq 2 ]; then
+    if [ $plat_variant -eq 2 ] || [ $plat_variant -eq 3 ]; then
+        if [ $plat_variant -eq 2 ]; then
+            # Use SCP binary from SCP build if it exists, or fetch pre-built ones.
+            if [ ! -f "$archive/scp_ram.bin" ]; then
                 url="$scp_mcp_downloads/totalcompute/tc$plat_variant/platform_variant_0/release/tc$plat_variant-bl2.bin" saveas="scp_ram.bin" fetch_file
-            elif [ $plat_variant -eq 3 ]; then
-                url="$tfa_downloads/total_compute/tc$plat_variant/scp/tc$plat_variant-bl2.bin" saveas="scp_ram.bin" fetch_file
             fi
-            archive_file "scp_ram.bin"
+        elif [ $plat_variant -eq 3 ]; then
+            # Use pre-built SCP BL2 binary
+            url="$tfa_downloads/total_compute/tc$plat_variant/scp/$scp_revision/tc$plat_variant-bl2.bin" saveas="scp_ram.bin" fetch_file
         fi
+        archive_file "scp_ram.bin"
     fi
 
     if [ $plat_variant -eq 2 ] || [ $plat_variant -eq 3 ]; then