drivers: i2s: code refactor
drivers: i2s: code refactor

Declaration code for the I2S devices in the driver has too much
duplicate code. This commit uses a help macro to save some work
and some lines of code.

Signed-off-by: Song Qiang <c598b3ff423ba743d91ae7caa6428138a985a8a3@gmail.com>

galak/zephyr,galak/zephyr,Vudentz/zephyr,Vudentz/zephyr,finikorg/zephyr,nashif/zephyr,Vudentz/zephyr,Vudentz/zephyr,finikorg/zephyr,nashif/zephyr,nashif/zephyr,nashif/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,Vudentz/zephyr,galak/zephyr,Vudentz/zephyr,galak/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,nashif/zephyr