ASoC: rt5645: remove unexisting route on new rt5645

"SPOL MIX DAC R1 Switch" and "SPOL MIX SPKVOL R Switch" are only
exist in the early version of rt5645.

Signed-off-by: Bard Liao <bardliao@realtek.com>
Signed-off-by: Mark Brown <broonie@kernel.org>