openssl: Add legacy packageconfig option

openssl: Add legacy packageconfig option

Add packageconfig option to enable legacy support (disabled by default).
The legacy module includes deprecated and unmaintained OpenSSL
components. Drops openssl-oss-module-legacy from a runtime depends to a
runtime recommends for ptest.

Signed-off-by: Colin Pinnell McAllister <colinmca242@gmail.com>
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>