There are already defined ppcap and ppcap interrupt functions, use
the already defined functions for easy code read.

Fixes: 8a300c8f ("ASoC: SOF: Intel: Add HDA controller for Intel DSP")
Reviewed-by: NTakashi Iwai <tiwai@suse.de>
Signed-off-by: NZhu Yingjiang <yingjiang.zhu@linux.intel.com>
Signed-off-by: NPierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: NMark Brown <broonie@kernel.org>