mfd: wm5102: Deactivate standard boot sequence

This patch deactivates the standard, currently noop, boot sequence
because we now have facilities in place for running a custom boot
sequence.

Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>