regulator: max77802: Remove .set_ramp_delay from max77802_buck_dvs_ops

max77802_set_ramp_delay_2bit() returns -EINVAL when id > MAX77802_BUCK4.
This was a leftover in commit b0615f1d
("regulator: max77802: Split regulator operations for BUCKs").

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Link: https://lore.kernel.org/r/20210523072320.2174443-1-axel.lin@ingics.com


Signed-off-by: Mark Brown <broonie@kernel.org>