ASoC: Remove WM8995 write sequencer bitfield definitions

They're very verbose and extremely repetitive so bulk up the kernel more
than is ideal. If required we can readd with WRITE_SEQUENCER_n type
definitions that cover the entire register bank in a few defines.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>