musl-locales: Add package

musl-locales: Add package

This package will provide a limited set of localedata for musl based
systems. It will fill in into images when IMAGE_LINGUAS variable is set
however the choice is limited to the given 13 locales as of now.

e.g.
IMAGE_LINGUAS ?= "de-de fr-fr en-gb"

would work fine

Default locale can be set by exporting LANG=<locale> in /etc/profile or some
such file e.g.

export LANG=de_DE.UTF-8

This will also help in ptest coverage with musl where some test packages
expect locales e.g. pango to name one.

Do not empty out IMAGE_LINGUAS forcibly for musl anymore

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>