serial: uniphier: move CONFIG_UNIPHIER_SERIAL to Kconfig

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Acked-by: Simon Glass <sjg@chromium.org>
diff --git a/include/configs/ph1_ld4.h b/include/configs/ph1_ld4.h
index a546865..005a853 100644
--- a/include/configs/ph1_ld4.h
+++ b/include/configs/ph1_ld4.h
@@ -28,9 +28,7 @@
  *   SoC UART     : enable CONFIG_UNIPHIER_SERIAL
  *   On-board UART: enable CONFIG_SYS_NS16550_SERIAL
  */
-#if 1
-#define CONFIG_UNIPHIER_SERIAL
-#else
+#if 0
 #define CONFIG_SYS_NS16550_SERIAL
 #endif