MINOR: ssl: pass ckch_store instead of ckch_data to ssl_sock_load_ocsp()

MINOR: ssl: pass ckch_store instead of ckch_data to ssl_sock_load_ocsp()

ssl_sock_put_ckch_into_ctx() and ssl_sock_load_ocsp() need to take a
ckch_store in argument. Indeed the ocsp_update_mode is not stored
anymore in ckch_data, but in ckch_conf which is part of the ckch_store.

This is a minor change, but the function definition had to change.