dai: intel: dmic: Refactor power management initialization

This patch refactors the power management initialization for the DMIC
driver across ACE15, ACE20, and ACE30 generations to align with the
recommended practices outlined in the documentation. The changes
include:

1. Replacing the conditional initialization of power management state
   with a call to `pm_device_driver_init` in the
   `dai_dmic_initialize_device` function.
2. Adding the `zephyr,pm-device-runtime-auto` property to the DMIC nodes
   in the device tree files for ACE15, ACE20, and ACE30.

These changes ensure that the DMIC driver is initialized with the
appropriate power management state and that runtime power management is
automatically enabled based on the device tree configuration. The
functionality of the power management state remains unchanged, ensuring
consistent behavior.

Signed-off-by: Tomasz Leman <tomasz.m.leman@intel.com>