kernel: backport ZTE RNDIS bogus MAC address fix

kernel: backport ZTE RNDIS bogus MAC address fix

This is required to support built-in modem of ZTE MF286R, in addition to
other external modems, such as MF831, MF910, MF920, which refuse to
reconfigure their remote MAC address, even if "locally administered" bit
is set, leading to dropped traffic towards the host. Add a workaround
for that issue already present in cdc_ether to rndis_host driver as
well.

Signed-off-by: Lech Perczak <lech.perczak@gmail.com>
(cherry picked from commit c99013e242682a71051619806f9cc4f4e51a58fa)