crypto: octeontx2 - Rework how engine group number is obtained

crypto: octeontx2 - Rework how engine group number is obtained

By default, otx2_cpt_get_kcrypto_eng_grp_num() returns the engine group
number of SE engine type. Add an engine type parameter to support
retrieving the engine group number for different engine types.

Since otx2_cpt_get_kcrypto_eng_grp_num() always returns the kernel crypto
engine group number, rename it to otx2_cpt_get_eng_grp_num().

Signed-off-by: Amit Singh Tomar <amitsinght@marvell.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>