timeData hours 'regions' are also locales

Some code/spec/data archeology here…

While working on https://unicode-org.atlassian.net/browse/CLDR-14642#icft=CLDR-14642 (bcp47 for cldr-json) I ran into this issue.

• TR35 says that the `<hours regions=…/>` attribute is a list of regions.

However, the data actually has a mismash of regions and locale IDs.

How did we get here?

• https://unicode-org.atlassian.net/browse/CLDR-10120#icft=CLDR-10120 updated the DTD metadata to allow region or locale

https://github.com/unicode-org/cldr/commit/5402171414f7af02bb97a2807f83bae2494acf23#diff-0c05fb67bed20d205660988e57e8438014bcde6954263c6f66e1b9fc535e6850R340

• https://unicode-org.atlassian.net/browse/CLDR-8959#icft=CLDR-8959 has a comment (and added the initial data)

> Also change spec to allow for locales, which must have an underbar in them, eg fr_CA. (Could extend in future to subregions.)

however the spec was not updated.

This structure will make it challenging for implementations. It might be better to have 'locales=…' instead, or perhaps, to promote all regions to locales, as in `und_TF ca_ES gl_ES`.

At least, the spec should be updated.