net/9p/usbg: fix CONFIG_USB_GADGET dependency

When USB gadget support is in a loadable module, 9pfs cannot
link to it as a built-in driver:

x86_64-linux-ld: vmlinux.o: in function `usb9pfs_free_func':
trans_usbg.c:(.text+0x1070012): undefined reference to `usb_free_all_descriptors'
x86_64-linux-ld: vmlinux.o: in function `disable_ep':
trans_usbg.c:(.text+0x1070528): undefined reference to `usb_ep_disable'
x86_64-linux-ld: vmlinux.o: in function `usb9pfs_func_unbind':
trans_usbg.c:(.text+0x10705df): undefined reference to `usb_ep_free_request'
x86_64-linux-ld: trans_usbg.c:(.text+0x107061f): undefined reference to `usb_ep_free_request'
x86_64-linux-ld: vmlinux.o: in function `usb9pfs_func_bind':
trans_usbg.c:(.text+0x107069f): undefined reference to `usb_interface_id'
x86_64-linux-ld: trans_usbg.c:(.text+0x10706b5): undefined reference to `usb_string_id'

Change the Kconfig dependency to only allow this to be enabled
when it can successfully link and work.

Fixes: a3be076 ("net/9p/usbg: Add new usb gadget function transport")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20240909111745.248952-1-arnd@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

net/9p/Kconfig

@@ -42,7 +42,7 @@ config NET_9P_XEN
 
 config NET_9P_USBG
 	bool "9P USB Gadget Transport"
-	depends on USB_GADGET
+	depends on USB_GADGET=y || USB_GADGET=NET_9P
 	help
 	  This builds support for a transport for 9pfs over
 	  usb gadget.