soundwire: generic_bandwidth_allocation use bus->params.max_dr_freq

soundwire: generic_bandwidth_allocation use bus->params.max_dr_freq

bus->params.max_dr_freq is calculated and set in sdw_bus_master_add().
We can use it directly instead of calculating it again.

Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Rander Wang <rander.wang@intel.com>
Link: https://lore.kernel.org/r/20231127124405.2080431-1-yung-chuan.liao@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>