Add target maintainer information for powerpc64-unknown-linux-musl

We intend to fix the outstanding issues on the target and eventually
promote it to tier 2. We have the capacity to maintain this target in
the future and already perform regular builds of rustc for this target.

Currently, all host tools except miri build fine, but I have a patch for
libffi-sys to make miri also compile fine for this target that is
pending review [1].

While at it, add an option for the musl root for this target.

[1]: https://github.com/tov/libffi-rs/pull/100

Signed-off-by: Jens Reidel <adrian@travitia.xyz>

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