staging: ccree: rename staging ver and mark as broken

Rename the Kconfig var of the staging tree version of the driver
in preparation of introducing the final version of the driver
into the cryptodev tree to avoid link time symbol collisions.

Signed-off-by: Gilad Ben-Yossef <gilad@benyossef.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>