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>

include/configs/sun4i.h

@@ -13,7 +13,6 @@
  */
 #define CONFIG_CLK_FULL_SPEED		1008000000
 
-#define CONFIG_SYS_PROMPT		"sun4i# "
 #define CONFIG_MACH_TYPE		4104
 
 #ifdef CONFIG_USB_EHCI

include/configs/sun5i.h

@@ -13,7 +13,6 @@
  */
 #define CONFIG_CLK_FULL_SPEED		1008000000
 
-#define CONFIG_SYS_PROMPT		"sun5i# "
 #define CONFIG_MACH_TYPE		4138
 
 #ifdef CONFIG_USB_EHCI

include/configs/sun6i.h

@@ -16,8 +16,6 @@
  */
 #define CONFIG_CLK_FULL_SPEED		1008000000
 
-#define CONFIG_SYS_PROMPT		"sun6i# "
-
 #ifdef CONFIG_USB_EHCI
 #define CONFIG_USB_EHCI_SUNXI
 #define CONFIG_USB_MAX_CONTROLLER_COUNT	2

include/configs/sun7i.h

@@ -14,7 +14,6 @@
  */
 #define CONFIG_CLK_FULL_SPEED		912000000
 
-#define CONFIG_SYS_PROMPT		"sun7i# "
 #define CONFIG_MACH_TYPE		4283
 
 #ifdef CONFIG_USB_EHCI

include/configs/sun8i.h

@@ -14,8 +14,6 @@
  */
 #define CONFIG_CLK_FULL_SPEED	1008000000
 
-#define CONFIG_SYS_PROMPT	"sun8i# "
-
 #ifdef CONFIG_USB_EHCI
 #define CONFIG_USB_EHCI_SUNXI
 #define CONFIG_USB_MAX_CONTROLLER_COUNT	1

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