drivers: i2s: Add framelength property to i2s_mcux_flexcomm.c driver.

When the number of bit clock on the bus between two neighboring WS
value is greater than bitWidth times lineChannels, frameLength needs
to be set to the value that is equal to the number of bit clock
between two neighboring WS signal.

update dts/bindings/i2s/nxp,lpc-i2s.yaml after yamllint

run clang-format, squashed commits

Signed-off-by: Jan Michaels <[email protected]>

Author: janmft