soundwire: cadence_master: improve PDI allocation

[ Upstream commit 1b53385e7938d5a093e92044f9c89e4e76106f1b ]

PDI number should match dai->id, there is no need to track if a PDI is
allocated or not.

Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20190916192348.467-7-pierre-louis.bossart@linux.intel.com


Signed-off-by: Vinod Koul <vkoul@kernel.org>
Stable-dep-of: 8ee1b439b154 ("soundwire: cadence: fix invalid PDI offset")
Signed-off-by: Sasha Levin <sashal@kernel.org>