ALSA: hda: cs35l56: Fix lifecycle of codec pointer

[ Upstream commit d339131b

 ]

The codec should be cleared when the amp driver is unbound and when
resuming it should be tested to prevent loading firmware into the device
and ALSA in a partially configured system state.

Signed-off-by: Simon Trimmer <simont@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20240531112716.25323-1-simont@opensource.cirrus.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>