The Khadas VIM3 [1] is a popular devboard (SBC).
It has an Amlogic A311D SoC and is well supported in mainline linux.
Add board support in testing.
Note that we use the soc-amlogic-s905 package which also provides
support for A311d.
[1] https://www.khadas.com/vim3
Signed-off-by: Mattijs Korpershoek <mattijs.korpershoek@gmail.com>
