sunxi: Add DRAM_SUN8I_A23 kconfig entry

Add proper and simple kconfig option for dram_sun8i_a23.c
instead of using MACH type on Makefile.
Signed-off-by: NJagan Teki <jagan@amarulasolutions.com>
Acked-by: NMaxime Ripard <maxime.ripard@bootlin.com>

arch/arm/mach-sunxi/Kconfig

@@ -18,6 +18,12 @@ config DRAM_SUN6I
 	  Select this dram controller driver for Sun6i platforms,
 	  like A31/A31s.
 
+config DRAM_SUN8I_A23
+	bool
+	help
+	  Select this dram controller driver for Sun8i platforms,
+	  for A23 SOC.
+
 config DRAM_SUN9I
 	bool
 	help
@@ -163,6 +169,7 @@ config MACH_SUN8I_A23
 	select CPU_V7_HAS_NONSEC
 	select CPU_V7_HAS_VIRT
 	select ARCH_SUPPORT_PSCI
+	select DRAM_SUN8I_A23
 	select SUNXI_GEN_SUN6I
 	select SUPPORT_SPL
 	select ARMV7_BOOT_SEC_DEFAULT if OLD_SUNXI_KERNEL_COMPAT

arch/arm/mach-sunxi/Makefile

@@ -35,8 +35,8 @@ obj-$(CONFIG_MACH_SUN9I)	+= clock_sun9i.o gtbus_sun9i.o
 ifdef CONFIG_SPL_BUILD
 obj-$(CONFIG_DRAM_SUN4I)	+= dram_sun4i.o
 obj-$(CONFIG_DRAM_SUN6I)	+= dram_sun6i.o
+obj-$(CONFIG_DRAM_SUN8I_A23)	+= dram_sun8i_a23.o
 obj-$(CONFIG_DRAM_SUN9I)	+= dram_sun9i.o
-obj-$(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_SPL_SPI_SUNXI)	+= spl_spi_sunxi.o