soc: ti_simplelink: Add missing SoC

Adds a missing SoC that was previously converted

Signed-off-by: Jamie McCrae <jamie.mccrae@nordicsemi.no>

soc/ti/simplelink/soc.yml

@@ -17,3 +17,6 @@ family:
     socs:
     - name: cc3220sf
     - name: cc3235sf
+  - name: msp432p4xx
+    socs:
+    - name: msp432p401r