buildroot

package/openssl: depend on the virtual cryptodev package

Instead of depending on each provider of cryptodev, make openssl depend
on the virtual package.

This is easy because in both cases the openssl build systems needs the
same configuration options.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>