drivers: dai: sai: Add support for all SYNC modes

With the introduction of the "rx_sync_mode" and "tx_sync_mode"
properties, the user may choose which synchronization mode the
SAI should use. To support this, the code had to be changed a
bit such that the software reset and the disable operations
work on all synchronization modes.

What this commit does, is it changes the software reset and
disable sequences such that they work with any of the
supported synchronization modes. Also, the syncMode field
of sai_transceiver_t structure is set to the value passed
from the DTS during sai_config_set().

Signed-off-by: Laurentiu Mihalcea <laurentiu.mihalcea@nxp.com>