ASoC: cs35l3x: Use neutral language in amp drivers

Revise variable names and comments in
cs35l35 and cs35l36 amp drivers.

Signed-off-by: David Rhodes <drhodes@opensource.cirrus.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Message-Id: <20210525194439.2232908-1-drhodes@opensource.cirrus.com>
Signed-off-by: Mark Brown <broonie@kernel.org>