kernel: usb: package MaxLinear/Exar USB serial driver

Currently, MaxLinear/Exar USB serial devices are supported via out-of-tree
usb-serial-xr_usb_serial_common driver which is broken on 6.12.

So since upstream has support for these devices since 6.5 lets package
the in-tree driver to be able to drop the out-of-tree one.

Link: https://github.com/openwrt/openwrt/pull/18926
Signed-off-by: Robert Marko <[email protected]>

package/kernel/linux/modules/usb.mk

@@ -1034,6 +1034,21 @@ endef
 $(eval $(call KernelPackage,usb-serial-qualcomm))
 
 
+define KernelPackage/usb-serial-xr
+  TITLE:=Support for MaxLinear/Exar USB to Serial devices
+  KCONFIG:=CONFIG_USB_SERIAL_XR
+  FILES:=$(LINUX_DIR)/drivers/usb/serial/xr_serial.ko
+  AUTOLOAD:=$(call AutoProbe,xr_serial)
+  $(call AddDepends/usb-serial)
+endef
+
+define KernelPackage/usb-serial-xr/description
+ Kernel support for MaxLinear/Exar USB to Serial converter devices
+endef
+
+$(eval $(call KernelPackage,usb-serial-xr))
+
+
 define KernelPackage/usb-storage
   TITLE:=USB Storage support
   DEPENDS:= +kmod-scsi-core