sunxi: Add selective DRAM type and timing

DRAM chip varies, and one code cannot satisfy all DRAMs.

Add options to select a timing set.

Currently only DDR3-1333 (the original set) is added into it.

Signed-off-by: Icenowy Zheng <icenowy@aosc.xyz>
Reviewed-by: Jagan Teki <jagan@amarulasolutions.com>
Tested-by: Jagan Teki <jagan@amarulasolutions.com>
diff --git a/arch/arm/mach-sunxi/Makefile b/arch/arm/mach-sunxi/Makefile
index 41cee26..2a3c379 100644
--- a/arch/arm/mach-sunxi/Makefile
+++ b/arch/arm/mach-sunxi/Makefile
@@ -49,5 +49,6 @@
 obj-$(CONFIG_MACH_SUN8I_A33)	+= dram_sun8i_a33.o
 obj-$(CONFIG_MACH_SUN8I_A83T)	+= dram_sun8i_a83t.o
 obj-$(CONFIG_SUNXI_DRAM_DW)	+= dram_sunxi_dw.o
+obj-$(CONFIG_SUNXI_DRAM_DW)	+= dram_timings/
 obj-$(CONFIG_MACH_SUN9I)	+= dram_sun9i.o
 endif