power_domain: intel_adsp: initialize after DMA

Change the power_domain_intel_adsp initialization priority so that it
initializes after the DMA driver that it depends on.

Fixes a few:

ERROR: /soc/dma@72c00 POST_KERNEL 40 69 <
	/soc/dfpmccu@71b00/hst_domain POST_KERNEL 75 65
ERROR: /soc/dma@72400 POST_KERNEL 40 66 <
	/soc/dfpmccu@71b00/hst_domain POST_KERNEL 75 65
...

Signed-off-by: Fabio Baltieri <fabiobaltieri@google.com>