Device support is based on the patch set linked in the OpenWrt Wiki. [1][2]
The aux-loader blob is not included, as it is only required for initial
installation.
Two additional kernel patches for mvpp2 are added to allow receive
hashing to work properly in the DSA setup of the device.
[1] https://openwrt.org/toh/mikrotik/rb5009ug_s_in#installation
[2] https://paste.myconan.net/482114
Signed-off-by: Fabian Bläse <fabian@blaese.de>