release/dist: add deb/rpm arch mappings for mipses

According to https://wiki.debian.org/SupportedArchitectures Debian does
not support big-endian mips64, so that one remains disabled.

According to https://fedoraproject.org/wiki/Architectures Fedora only
supports little-endian mips, so leaving both big-endian ones out too.

Updates #8005.

Signed-off-by: salman <salman@tailscale.com>
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