Build: Add RSS config to build

Adds a config for the RSS platform for nightly and release builds.

Signed-off-by: Jamie Fox <jamie.fox@arm.com>
Change-Id: I0782def672304f030bf339176433017cb807ea4e
diff --git a/build_helper/build_helper_config_maps.py b/build_helper/build_helper_config_maps.py
index 13e8c9a..c421291 100644
--- a/build_helper/build_helper_config_maps.py
+++ b/build_helper/build_helper_config_maps.py
@@ -26,6 +26,7 @@
     "arm/musca_s1"                       : "MUSCA_S1",
     "arm/corstone1000"                   : "corstone1000",
     "arm/mps3/corstone310_fvp"           : "corstone310",
+    "arm/rss"                            : "RSS",
     "cypress/psoc64"                     : "psoc64",
     "lairdconnectivity/bl5340_dvk_cpuapp": "BL5340",
     "nordic_nrf/nrf5340dk_nrf5340_cpuapp": "nrf5340dk",