core(h7rs): reference STM32H7RSxx series

Signed-off-by: Frederic Pillon <frederic.pillon@st.com>

Author: fpistm

CI/update/stm32_series.json

@@ -23,7 +23,8 @@
     "WBA": "xx",
     "WB": "xx",
     "WL3": "x",
-    "WL": "xx"
+    "WL": "xx",
+    "H7RS": "xx"
   },
   "seriesv2": {
     "C5": "xx"