sunxi: automatically select SPL_NAND_SUPPORT in Kconfig

Make SUNXI_NAND select SPL_NAND_SUPPORT in Kconfig, this limit the
number of entries to add in defconfig files when adding NAND support.

For now, the only board using it is the CHIP pro.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Acked-by: Maxime Ripard <maxime.ripard@bootlin.com>
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
diff --git a/drivers/mtd/nand/Kconfig b/drivers/mtd/nand/Kconfig
index dcb8ff6..75eefc8 100644
--- a/drivers/mtd/nand/Kconfig
+++ b/drivers/mtd/nand/Kconfig
@@ -98,6 +98,7 @@
 	depends on MACH_SUN4I || MACH_SUN5I || MACH_SUN7I || MACH_SUN8I
 	select SYS_NAND_SELF_INIT
 	select SYS_NAND_U_BOOT_LOCATIONS
+	select SPL_NAND_SUPPORT
 	imply CMD_NAND
 	---help---
 	Enable support for NAND. This option enables the standard and