ipq40xx: kmod-usb-dwc3-of-simple vs kmod-usb-dwc3-qcom

Robert Marko <robimarko@gmail.com> noted in
"ipq40xx: Use kmod-usb-dwc3-qcom by default":
| Since 4.18 we cant use DWC3 OF Simple anymore so we
| have to use kmod-usb-dwc3-qcom.

This patch adds a TODO right next to the KERNEL_PATCHVER so
it will be picked up when moving to 4.19.

I would also like to point out:

All users/devs that are compiling their own images from source
and have a existing 4.14 config and want to switch to 4.19:

Please drop kmod-usb-dwc3-of-simple and add kmod-usb-dwc3-qcom
module package. Otherwise, the USB port on your router will no
longer work.

Signed-off-by: Christian Lamparter <chunkeey@gmail.com>

target/linux/ipq40xx/Makefile

@@ -8,6 +8,7 @@ CPU_TYPE:=cortex-a7
 CPU_SUBTYPE:=neon-vfpv4
 MAINTAINER:=John Crispin <john@phrozen.org>
 
+# TODO: drop kmod-usb-dwc3-of-simple when migrating to 4.19
 KERNEL_PATCHVER:=4.14
 
 KERNELNAME:=zImage Image dtbs