NanoMIPS ISA is supported again, since MediaTek is taking over
nanoMIPS toolchain development (confirmed at
https://www.spinics.net/linux/fedora/libvir/msg217107.html).
New release of the toolchain can be found at
(
https://github.com/MediaTek-Labs/nanomips-gnu-toolchain/releases/tag/nanoMIPS-2021.02-01).
Reverting deprecation of nanoMIPS ISA requires following changes:
MAINTAINERS: remove nanoMIPS ISA from orphaned ISAs
deprecated.rst: remove nanoMIPS ISA from deprecated ISAs