ASoC: mediatek: fix double free in mt2701_afe_pcm_dev_probe()

The commit dfa3cbb8(ASoC: mediatek: modify MT2701 AFE driver to adapt mfd device)
leads to the following static checker warning:

	sound/soc/mediatek/mt2701/mt2701-afe-pcm.c:1535 mt2701_afe_pcm_dev_probe()
	error: double free of 'component'

This patch fixes that and adds a helper mt2701_afe_add_component() to setup
component.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Ryder Lee <ryder.lee@mediatek.com>
Signed-off-by: Mark Brown <broonie@kernel.org>