sunxi: makes an invisible option for H3-like DRAM controllers

Allwinner SoCs after H3 (e.g. A64, H5, R40, V3s) uses a H3-like
DesignWare DRAM controller, which do not have official free DRAM
initialization code, but can use modified dram_sun8i_h3.c.

Add a invisible option for easier DRAM initialization code reuse.

Signed-off-by: Icenowy Zheng <icenowy@aosc.xyz>
Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>
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 5510aa5..41cee26 100644
--- a/arch/arm/mach-sunxi/Makefile
+++ b/arch/arm/mach-sunxi/Makefile
@@ -48,8 +48,6 @@
 obj-$(CONFIG_MACH_SUN8I_A23)	+= dram_sun8i_a23.o
 obj-$(CONFIG_MACH_SUN8I_A33)	+= dram_sun8i_a33.o
 obj-$(CONFIG_MACH_SUN8I_A83T)	+= dram_sun8i_a83t.o
-obj-$(CONFIG_MACH_SUNXI_H3_H5)	+= dram_sun8i_h3.o
-obj-$(CONFIG_MACH_SUN8I_R40)	+= dram_sun8i_h3.o
+obj-$(CONFIG_SUNXI_DRAM_DW)	+= dram_sunxi_dw.o
 obj-$(CONFIG_MACH_SUN9I)	+= dram_sun9i.o
-obj-$(CONFIG_MACH_SUN50I)	+= dram_sun8i_h3.o
 endif