MXRT600: Add SDK I2S drivers

Builds the i.MX RT600 I2S driver when the corresponding
i2sx shim driver is enabled.

Signed-off-by: Mahesh Mahadevan <[email protected]>

Author: mmahadevan108

mcux/drivers/imxrt6xx/CMakeLists.txt

@@ -15,6 +15,7 @@ zephyr_sources_ifdef(CONFIG_HAS_MCUX_CACHE    fsl_cache.c)
 zephyr_sources_ifdef(CONFIG_SPI_MCUX_FLEXCOMM   fsl_spi.c fsl_flexcomm.c)
 zephyr_sources_ifdef(CONFIG_I2C_MCUX_FLEXCOMM   fsl_i2c.c fsl_flexcomm.c)
 zephyr_sources_ifdef(CONFIG_UART_MCUX_FLEXCOMM	fsl_usart.c fsl_flexcomm.c)
+zephyr_sources_ifdef(CONFIG_I2S_MCUX_FLEXCOMM	fsl_i2s.c fsl_flexcomm.c)
 zephyr_sources_ifdef(CONFIG_GPIO_MCUX_LPC     fsl_gpio.c fsl_pint.c fsl_inputmux.c)
 zephyr_sources_ifdef(CONFIG_DMA_MCUX_LPC      fsl_dma.c)
 zephyr_sources_ifdef(CONFIG_MCUX_ACMP         fsl_acmp.c)