ASoC: omap-dmic: Use devm_clk_get

This patch introduces the use of managed interfaces like devm_clk_get
and does away with the clk_puts in the probe and remove functions. A
label is also done away with.

Signed-off-by: Himangi Saraogi <himangi774@gmail.com>
Acked-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Mark Brown <broonie@linaro.org>