ASoC: rt5514: make the volume TLV to match the units 0.01dB

The volume have a step of 0.375dB, but TLV uses the units 0.01dB. It should
be changed to a step of 0.75dB to match the units of TLV.

Signed-off-by: Oder Chiou <oder_chiou@realtek.com>
Signed-off-by: Mark Brown <broonie@kernel.org>