exo/fusee: add support for new master key

exosphere/src/smc_user.c

@@ -50,6 +50,7 @@ static bool is_user_keyslot_valid(unsigned int keyslot) {
             return keyslot <= 3;
         case ATMOSPHERE_TARGET_FIRMWARE_600:
         case ATMOSPHERE_TARGET_FIRMWARE_620:
+        case ATMOSPHERE_TARGET_FIRMWARE_700:
         default:
             return keyslot <= 5;
     }