Build: Enable rse/rdfremont build

Add configuration for RSE RD-Fremont.

Signed-off-by: Joel Goddard <joel.goddard@arm.com>
Change-Id: I1900db48a41e361615bb22689cc7b4f92c0bb88b
diff --git a/build_helper/build_helper_config_maps.py b/build_helper/build_helper_config_maps.py
index 546d55f..aee55fd 100644
--- a/build_helper/build_helper_config_maps.py
+++ b/build_helper/build_helper_config_maps.py
@@ -24,7 +24,8 @@
     "arm/musca_s1"                       : "MUSCA_S1",
     "arm/corstone1000"                   : "corstone1000",
     "arm/mps3/corstone310/fvp"           : "corstone310",
-    "arm/rse/tc"                         : "RSE",
+    "arm/rse/tc"                         : "RSE_TC",
+    "arm/rse/rdfremont"                  : "RSE_RDFremont",
     "cypress/psoc64"                     : "psoc64",
     "lairdconnectivity/bl5340_dvk_cpuapp": "BL5340",
     "nordic_nrf/nrf5340dk_nrf5340_cpuapp": "nrf5340dk",
@@ -95,6 +96,9 @@
                       "-DTEST_S_IPC=OFF "
                       "-DEXTRA_S_TEST_SUITE_PATH=%(codebase_root_dir)s/platform/ext/target/arm/corstone1000/ci_regression_tests/ "),
 
+    # Platform Variants Support
+    "CFG0"         : "-DTFM_PLATFORM_VARIANT=0",
+
     # Extra test cases
     "TEST_CBOR"    : "-DTEST_NS_QCBOR=ON ",