DM: crypto/fsl: Enable rsa DM driver usage before relocation

Enable rsa signature verification in SPL framework before relocation for
verification of main u-boot.

Reviewed-by: Aneesh Bansal <aneesh.bansal@nxp.com>
Signed-off-by: Sumit Garg <sumit.garg@nxp.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: York Sun <york.sun@nxp.com>