ARM: UniPhier: enable CONFIG_PANIC_HANG

Do not reset board on panic, which allows us to not link reset_cpu()
into SPL.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

include/configs/uniphier.h

 /*
  * Copyright (C) 2012-2015 Panasonic Corporation
- *   Author: Masahiro Yamada <yamada.m@jp.panasonic.com>
+ * Copyright (C) 2015      Socionext Inc.
+ *   Author: Masahiro Yamada <yamada.masahiro@socionext.com>
  *
  * SPDX-License-Identifier:	GPL-2.0+
  */
@@ -288,6 +289,8 @@
 #define CONFIG_SYS_INIT_SP_ADDR		((CONFIG_SYS_TEXT_BASE) - 0x00001000)
 #endif
 
+#define CONFIG_PANIC_HANG
+
 #define CONFIG_SPL_FRAMEWORK
 #define CONFIG_SPL_NAND_SUPPORT