sts: add STS_UNREACHABLE_DEFAULT_CASE()

stratosphere/boot/source/gpio/gpio_initial_configuration.cpp

@@ -69,9 +69,8 @@ namespace sts::gpio {
                     configs = InitialConfigsIowa;
                     num_configs = NumInitialConfigsIowa;
                     break;
-                default:
-                    /* Unknown hardware type, we can't proceed. */
-                    std::abort();
+                /* Unknown hardware type, we can't proceed. */
+                STS_UNREACHABLE_DEFAULT_CASE();
             }
         } else {
             /* Until 2.0.0, the GPIO map for Icosa was used for all hardware types. */