Rollup merge of #131166 - madsmtm:target-info-switch-vendor, r=jieyouxu

Fix `target_vendor` for `aarch64-nintendo-switch-freestanding`

Previously set to `target_vendor = "unknown"`, but Nintendo is clearly the vendor of the Switch, and is also reflected in the target name itself.

CC target maintainers `@leo60228` and `@jam1garner`

Author: workingjubilee