ASoC: cs53l30: Rename the volume controls for preamplifier

Volume controls should end with 'Volume', so this patch renames them for
ADC preamplifier.

Signed-off-by: Nicolin Chen <nicoleotsuka@gmail.com>
Acked-by: Paul Handrigan <Paul.Handrigan@cirrus.com>
Signed-off-by: Mark Brown <broonie@kernel.org>