sunxi: Parameterize "unknown feature" in H616 DRAM driver

Part of the code, previously known as "unknown feature", also doesn't
have constant values. They are derived from TPR0 parameter in vendor
DRAM code.

Let's move that code to separate function and introduce TPR0 parameter
here too, to ease adding new boards.

Signed-off-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Acked-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
diff --git a/arch/arm/mach-sunxi/Kconfig b/arch/arm/mach-sunxi/Kconfig
index 7b38e83..fe34755 100644
--- a/arch/arm/mach-sunxi/Kconfig
+++ b/arch/arm/mach-sunxi/Kconfig
@@ -73,6 +73,12 @@
 	help
 	  ODT EN value from vendor DRAM settings.
 
+config DRAM_SUN50I_H616_TPR0
+	hex "H616 DRAM TPR0 parameter"
+	default 0x0
+	help
+	  TPR0 value from vendor DRAM settings.
+
 config DRAM_SUN50I_H616_TPR10
 	hex "H616 DRAM TPR10 parameter"
 	help