crypto: qat - Remove unused function declarations

Commit d8cba25d ("crypto: qat - Intel(R) QAT driver framework")
declared but never implemented these functions.

Signed-off-by: Yue Haibing <yuehaibing@huawei.com>
Acked-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>