sunxi: Use a common CONFIG_SYS_PROMPT

The CPU info is already logged during boot e.g.
   CPU:    Allwinner A20 (SUN7I)
so the prompt is just one more thing to change for each new SoC, just makes it
"sunxi#" instead.

Signed-off-by: Ian Campbell <ijc@hellion.org.uk>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
diff --git a/include/configs/sunxi-common.h b/include/configs/sunxi-common.h
index 7a66a4d..4a5cab2 100644
--- a/include/configs/sunxi-common.h
+++ b/include/configs/sunxi-common.h
@@ -40,6 +40,8 @@
  */
 #define CONFIG_DISPLAY_CPUINFO
 
+#define CONFIG_SYS_PROMPT	"sunxi# "
+
 /* Serial & console */
 #define CONFIG_SYS_NS16550
 #define CONFIG_SYS_NS16550_SERIAL