rockchip: board: Prepare for use of DM_USB_GADGET with DWC2_OTG

The board_usb_init() and board_usb_cleanup() functions is always
included when USB_GADGET and USB_GADGET_DWC2_OTG is enabled.

Prepare for a change to use DM_USB_GADGET with DWC2_OTG by adding an
extra ifdef condition. The extra separate ifdef for USB_GADGET prepare
for next patch that adds a g_dnl_bind_fixup() function.

Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/arch/arm/mach-rockchip/board.c b/arch/arm/mach-rockchip/board.c
index 4f666ae..9bd5b14 100644
--- a/arch/arm/mach-rockchip/board.c
+++ b/arch/arm/mach-rockchip/board.c
@@ -220,7 +220,8 @@
 }
 #endif
 
-#if defined(CONFIG_USB_GADGET) && defined(CONFIG_USB_GADGET_DWC2_OTG)
+#if IS_ENABLED(CONFIG_USB_GADGET)
+#if IS_ENABLED(CONFIG_USB_GADGET_DWC2_OTG) && !IS_ENABLED(CONFIG_DM_USB_GADGET)
 #include <usb.h>
 #include <linux/usb/otg.h>
 #include <usb/dwc2_udc.h>
@@ -296,6 +297,7 @@
 	return 0;
 }
 #endif /* CONFIG_USB_GADGET_DWC2_OTG */
+#endif /* CONFIG_USB_GADGET */
 
 #if IS_ENABLED(CONFIG_FASTBOOT)
 int fastboot_set_reboot_flag(enum fastboot_reboot_reason reason)