dai: dmic: Add missing include header
dai: dmic: Add missing include header

The code was missing #include <zephyr/kernel.h> which
caused a compilation error. Missing header has been added.

Signed-off-by: Adrian Warecki <3bc0c3dcbee80269f62e7fb9cd91c0d3be884dd9@intel.com>

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