dm: zynq: usb: Convert to CONFIG_DM_USB

Convert zynq USB to driver model. Note this is tested on zynq-zybo only.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 4a62d4b..9a7ebed 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -661,6 +661,7 @@
 	select DM_SERIAL
 	select DM_SPI_FLASH
 	select SPL_SEPARATE_BSS if SPL
+	select DM_USB if USB
 
 config ARCH_ZYNQMP
 	bool "Support Xilinx ZynqMP Platform"
@@ -671,6 +672,7 @@
 	select SUPPORT_SPL
 	select CLK
 	select SPL_CLK
+	select DM_USB if USB
 
 config TEGRA
 	bool "NVIDIA Tegra"