ASoC: Intel: boards: max98373: get dapm from cpu_dai

There is a prefix on max98373 codec, and the prefix will be added to
the pin name However, there is no prefix on the "Right Spk" and "Left
Spk" widgets.

To avoid getting a redundant prefix, we should get dapm from cpu_dai
component.

Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20210208234043.59750-3-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>