ASoC: Intel: cleanup runtime_pm initialization

For ACPI we missed to pm_runtime_enable() call which is required to tell PM
core that runtime on this device is enabled now. Since this is common to
both PCI and APCI move it out. Also for ACPI we do not require
pm_runtime_allow() call, so remove that

Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>