ARM: sunxi: use imply instead of bare default y in Kconfig

Fix annoying config redefines in SoC/board level Kconfig.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 07fd1e0..3adafd6 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -822,6 +822,14 @@
 	select USB_STORAGE if DISTRO_DEFAULTS
 	select USB_KEYBOARD if DISTRO_DEFAULTS
 	select USE_TINY_PRINTF
+	imply PRE_CONSOLE_BUFFER
+	imply SPL_GPIO_SUPPORT
+	imply SPL_LIBCOMMON_SUPPORT
+	imply SPL_LIBDISK_SUPPORT
+	imply SPL_LIBGENERIC_SUPPORT
+	imply SPL_MMC_SUPPORT if GENERIC_MMC
+	imply SPL_POWER_SUPPORT
+	imply SPL_SERIAL_SUPPORT
 
 config TARGET_TS4600
 	bool "Support TS4600"