ASoC: arizona: Add debug prints for output power up/down times

When debugging it is useful to check the total power up/down delay that
is executed as part of the coalesced output delay. This patch adds some
debug prints for this.

Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@kernel.org>