soundwire: cadence: remove unused sdw_cdns_master_ops declaration

sdw_cdns_master_ops has been removed since
commit c91605f4 ("soundwire: Remove cdns_master_ops"),
so remove it.

Signed-off-by: Gaosheng Cui <cuigaosheng1@huawei.com>
Link: https://lore.kernel.org/r/20220911093442.3221637-1-cuigaosheng1@huawei.com


Signed-off-by: Vinod Koul <vkoul@kernel.org>