[Arm-netbook] libre-riscv, first update

[Luke Kenneth Casson Leighton]

https://www.crowdsupply.com/libre-risc-v/m-class/updates/why-make-a-quad-core-64-bit-soc-surely-there-are-enough-already

in case anyone's interested, do subscribe to updates.  i'll post links
here anyway.

l.