crypto: ccp - Remove unused declaration sp_get_master()

This function is never implemented and used since introduction in
commit 720419f0 ("crypto: ccp - Introduce the AMD Secure Processor
device").
Signed-off-by: Yue Haibing <yuehaibing@huawei.com>
Acked-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/ccp/sp-dev.h

@@ -138,7 +138,6 @@ struct sp_device *sp_alloc_struct(struct device *dev);
 
 int sp_init(struct sp_device *sp);
 void sp_destroy(struct sp_device *sp);
-struct sp_device *sp_get_master(void);
 
 int sp_suspend(struct sp_device *sp);
 int sp_resume(struct sp_device *sp);