sunxi: s/sun8i/sun8i_a23/

This is a preparation patch for adding A33 support, which will have a
mach name of sun8i-a33.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Ian Campbell <ijc@hellion.org.uk>
diff --git a/board/sunxi/Kconfig b/board/sunxi/Kconfig
index b716a8b..3d865d1 100644
--- a/board/sunxi/Kconfig
+++ b/board/sunxi/Kconfig
@@ -46,7 +46,7 @@
 	select SUPPORT_SPL
 	select ARMV7_BOOT_SEC_DEFAULT if OLD_SUNXI_KERNEL_COMPAT
 
-config MACH_SUN8I
+config MACH_SUN8I_A23
 	bool "sun8i (Allwinner A23)"
 	select CPU_V7
 	select SUNXI_GEN_SUN6I
@@ -54,6 +54,12 @@
 
 endchoice
 
+# The sun8i SoCs share a lot, this helps to avoid a lot of "if A23 || A33"
+config MACH_SUN8I
+	bool
+	default y if MACH_SUN8I_A23 || MACH_SUN8I_A33
+
+
 config DRAM_CLK
 	int "sunxi dram clock speed"
 	default 312 if MACH_SUN6I || MACH_SUN8I