arm: sunxi: Use "imply" for USB without further guards

Given that ARCH_SUNXI already implies that USB_GADGET should be enable,
we should also imply USB being enabled.

Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index b068468..ea414fe 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -1177,7 +1177,6 @@
 	select SUNXI_GPIO
 	select SYS_NS16550
 	select SYS_THUMB_BUILD if !ARM64
-	select USB if DISTRO_DEFAULTS
 	select USB_KEYBOARD if DISTRO_DEFAULTS && USB_HOST
 	select USB_STORAGE if DISTRO_DEFAULTS && USB_HOST
 	select SPL_USE_TINY_PRINTF if SPL
@@ -1203,6 +1202,7 @@
 	imply SYSRESET
 	imply SYSRESET_WATCHDOG
 	imply SYSRESET_WATCHDOG_AUTO
+	imply USB
 	imply USB_GADGET
 	imply WDT