kernel: kmod-usb-serial-mos7720: support parallel port in MCS7715

In-kernel driver for MCS7715 USB-serial bridge has a bool option,
enabling support for parallel port on that chip - which is tied to the
same kernel module. Enable it and select kmod-ppdev, as the image size
increase is minimal and the package isn't bundled in the images by
default.

Signed-off-by: Lech Perczak <[email protected]>

package/kernel/linux/modules/usb.mk

@@ -750,8 +750,9 @@ $(eval $(call KernelPackage,usb-serial-mct))
 
 define KernelPackage/usb-serial-mos7720
   TITLE:=Support for Moschip MOS7720 devices
-  KCONFIG:=CONFIG_USB_SERIAL_MOS7720
+  KCONFIG:=CONFIG_USB_SERIAL_MOS7720 CONFIG_USB_SERIAL_MOS7715_PARPORT=y
   FILES:=$(LINUX_DIR)/drivers/usb/serial/mos7720.ko
+  DEPENDS:=+kmod-ppdev
   AUTOLOAD:=$(call AutoProbe,mos7720)
   $(call AddDepends/usb-serial)
 endef