ASoC: compress: Add helper functions for component open/free

There are 2 loops calling open and 4 loops calling free for all the
components on a DAI link. Factor out these loops into helper functions
to make the code a little clearer.

Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Acked-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Mark Brown <broonie@kernel.org>