ARM: sunxi: Add basic A31 support

Add a new sun6i machine that supports UART and MMC.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
[wens@csie.org: use SPDX labels, adapt to Kconfig system, drop ifdef
		around mmc and smp code, drop MACH_TYPE]
Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Acked-by: Ian Campbell <ijc@hellion.org.uk>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 109d49f..4317b69 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -450,6 +450,9 @@
 config TARGET_SUN5I
 	bool "Support sun5i"
 
+config TARGET_SUN6I
+	bool "Support sun6i"
+
 config TARGET_SUN7I
 	bool "Support sun7i"