arm: sunxi: Enable SPI/SPI-FLASH support for A64

SPI is available in Allwinner A64 SoC, so enable it
globally in Kconfig.

- CONFIG_SPI
- CONFIG_DM_SPI
- CONFIG_DM_SPI_FLASH

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
diff --git a/arch/arm/mach-sunxi/Kconfig b/arch/arm/mach-sunxi/Kconfig
index ffdf09f..16d41b8 100644
--- a/arch/arm/mach-sunxi/Kconfig
+++ b/arch/arm/mach-sunxi/Kconfig
@@ -275,7 +275,10 @@
 config MACH_SUN50I
 	bool "sun50i (Allwinner A64)"
 	select ARM64
+	select SPI
 	select DM_I2C
+	select DM_SPI if SPI
+	select DM_SPI_FLASH
 	select PHY_SUN4I_USB
 	select SUN6I_PRCM
 	select SUNXI_DE2