crypto: qat - add adf_rl_get_num_svc_aes() in rate limiting

Enhance the rate limiting (RL) infrastructure by adding
adf_rl_get_num_svc_aes() which can be used to fetch the number of engines
associated with the service type. Expand the structure adf_rl_hw_data
with an array that contains the number of AEs per service.

Implement adf_gen4_init_num_svc_aes() for QAT GEN4 devices to calculate
the total number of acceleration engines dedicated to a specific service.

Signed-off-by: Suman Kumar Chakraborty <suman.kumar.chakraborty@intel.com>
Reviewed-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>