soundwire: cadence: remove unused sdw_cdns_master_ops declaration

sdw_cdns_master_ops has been removed since
commit c91605f ("soundwire: Remove cdns_master_ops"),
so remove it.

Signed-off-by: Gaosheng Cui <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Vinod Koul <[email protected]>

Author: gscui

drivers/soundwire/cadence_master.h

@@ -158,7 +158,6 @@ struct sdw_cdns {
 /* Exported symbols */
 
 int sdw_cdns_probe(struct sdw_cdns *cdns);
-extern struct sdw_master_ops sdw_cdns_master_ops;
 
 irqreturn_t sdw_cdns_irq(int irq, void *dev_id);
 irqreturn_t sdw_cdns_thread(int irq, void *dev_id);