kernel: cdc_ncm: Add support for moving NDP to end of NCM frame

This patch was missing for kernel 4.0 and 4.1 in r46464. I also
replaced the version in OpenWrt with the version which went upstream
into the Linux mainline kernel.

This closes #20193 and #20192

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>


git-svn-id: svn://svn.openwrt.org/openwrt/trunk@46493 3c298f89-4303-0410-b956-a3cf2f4a3e73