dma: intel_adsp_hda: Refactor power management and correct power domains

This patch addresses several issues with the Intel ADSP HDA DMA driver:

1. Refactors the HDA DMA power management initialization. The previous
   use of `pm_device_runtime_enable` was incorrect. The updated approach
   relies on enabling runtime power management through the device tree
   using the `zephyr,pm-device-runtime-auto` property. Additionally, the
   patch removes redundant device initialization steps as these are already
   handled by `pm_device_driver_init` when the device is under a power
   domain.

2. Corrects the power domain assignment for the HDA link. The HDA link
   was previously assigned to the io0 power domain based on a
   misinterpretation of the documentation. The correct power domain
   assignment is now based on updated documentation for LNL, ensuring that
   the HDA link is associated with the appropriate power domain.

These changes ensure that the HDA DMA driver properly manages power
states, reducing power consumption and improving system stability, while
ensuring the correct power domains are used.

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