sunxi: Convert sun7i boards to use auto dram configuration

Currently we've separate detailed dram settings for all sun7i 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 A20-Olinuxino-Lime, A20-Olinuxino_MICRO, Bananapi,
Bananapro, Cubieboard2, Cubietruck, Mele_M3 and a Linksprite_pcDuino3.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Ian Campbell <ijc@hellion.org.uk>
diff --git a/configs/A20-OLinuXino_MICRO_defconfig b/configs/A20-OLinuXino_MICRO_defconfig
index 1c5a6f7..ac94c79 100644
--- a/configs/A20-OLinuXino_MICRO_defconfig
+++ b/configs/A20-OLinuXino_MICRO_defconfig
@@ -9,3 +9,6 @@
 +S:CONFIG_ARCH_SUNXI=y
 +S:CONFIG_MACH_SUN7I=y
 +S:CONFIG_TARGET_A20_OLINUXINO_M=y
++S:CONFIG_DRAM_CLK=384
++S:CONFIG_DRAM_ZQ=127
++S:CONFIG_DRAM_EMR1=4