sun6i: Make dram clk and zq value Kconfig options

It turns out that there is a too large spread between boards to handle this
with a default value, turn this into Kconfig options, and set the values
the factory images are using for the Colombus and Mele_M9 boards.

Note this changes the ZQ default when not overriden through defconfig from
120 to 123, as that is what most boards seem to actually use.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Ian Campbell <ijc@hellion.org.uk>

board/sunxi/Kconfig

@@ -32,6 +32,23 @@ config MACH_SUN8I
 
 endchoice
 
+if MACH_SUN6I
+
+config DRAM_CLK
+	int "sun6i dram clock speed"
+	default 312
+	---help---
+	Set the dram clock speed, valid range 240 - 480, must be a multiple
+	of 24.
+
+config DRAM_ZQ
+	int "sun6i dram zq value"
+	default 123
+	---help---
+	Set the dram zq value.
+
+endif
+
 config SYS_CONFIG_NAME
 	default "sun4i" if MACH_SUN4I
 	default "sun5i" if MACH_SUN5I