sunxi: Convert sun5i boards to use auto dram configuration

Currently we've separate detailed dram settings for all sun5i boards, this
moves them over to using auto dram configuration so that we can get rid of
all the per board dram_foo.c files.

This has been tested on a A10s-Olinuxino, A13-Olinuxino, A13-OlinuxinoM,
mk802-a10s and r7-tv-dongle board.

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 738b55e..f48b8c0 100644
--- a/board/sunxi/Kconfig
+++ b/board/sunxi/Kconfig
@@ -39,16 +39,14 @@
 	default 360 if MACH_SUN4I || MACH_SUN5I || MACH_SUN7I
 	---help---
 	Set the dram clock speed, valid range 240 - 480, must be a multiple
-	of 24. Note on sun4i / sun5i / sun7i this is only used by boards
-	which use dram autoconfig.
+	of 24.
 
 config DRAM_ZQ
 	int "sunxi dram zq value"
 	default 123 if MACH_SUN4I || MACH_SUN5I || MACH_SUN6I || MACH_SUN8I
 	default 127 if MACH_SUN7I
 	---help---
-	Set the dram zq value. Note on sun4i / sun5i / sun7i this is only
-	used by boards which use dram autoconfig.
+	Set the dram zq value.
 
 if MACH_SUN4I || MACH_SUN5I || MACH_SUN7I
 config DRAM_EMR1
@@ -56,8 +54,7 @@
 	default 0 if MACH_SUN4I
 	default 4 if MACH_SUN5I || MACH_SUN7I
 	---help---
-	Set the dram controller emr1 value. Note this is only used by boards
-	which use dram autoconfig.
+	Set the dram controller emr1 value.
 endif
 
 config SYS_CONFIG_NAME