The 10.1 includes a good many stability fixes related to the effort of
backporting upstream 10.2 firmware.  Also enables 802.1q vlan support.
Successfully tested on apu2.

The 10.4 firmwares including new backported code as well as stability
fixes.  10.4 has been tested on Fedora x86-64 platforms, but not on LEDE
specifically since I had issues compiling LEDE for my 9980/9984 AP hardware.

Signed-off-by: Ben Greear <greearb@candelatech.com>