proper card powerup handling

Now that the timers work as intended other voltages (that lead to
timeouts) may be used.

Change-Id: I6105ce7f827aaec8ac36b940766fe05d47145edb
diff --git a/ccid_host/cuart_driver_tty.c b/ccid_host/cuart_driver_tty.c
index 5f635b5..42a8430 100644
--- a/ccid_host/cuart_driver_tty.c
+++ b/ccid_host/cuart_driver_tty.c
@@ -284,7 +284,9 @@
 	case CUART_CTL_WTIME:
 		/* no driver-specific handling of this */
 		break;
-	case CUART_CTL_POWER:
+	case CUART_CTL_POWER_5V0:
+	case CUART_CTL_POWER_3V0:
+	case CUART_CTL_POWER_1V8:
 	case CUART_CTL_CLOCK:
 	default:
 		return -EINVAL;