crypto: qat - relocate and rename bank state structure definition

crypto: qat - relocate and rename bank state structure definition

The `bank_state` structure represents the state of a bank of rings.
As part of recent refactoring, the functions that interact with this
structure have been moved to a new unit, adf_bank_state.c.

To align with this reorganization, rename `struct bank_state` to
`struct adf_bank_state` and move its definition to adf_bank_state.h.
Also relocate the associated `struct ring_config` to the same header
to consolidate related definitions.

Update all references to use the new structure name.

This does not introduce any functional change.

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