zstd: add libzstd package

zstd: add libzstd package

Add a libzstd package to remove libstdc++ runtime dependency from
library users and reduce the dependencies and size of the library
package.

Add a lib package instead of a bin package to use a similar name as
other buildtools and be backward compatible.

Signed-off-by: Stefan Herbrechtsmeier <stefan.herbrechtsmeier@weidmueller.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>