regulator: core: Remove "ramp_delay not set" debug message

regulator: core: Remove "ramp_delay not set" debug message

This message shows up occasionally but in bursts (seen up to 30 times
per second on my ODROID N2+).

According to Matthias Kaehlcke's comment in 'regulator: core: silence
warning: "VDD1: ramp_delay not set"', this message should have been
removed after restructuring previous code that assumed that ramp_delay
being zero in that function was an error.

Link: https://lore.kernel.org/lkml/625675256c0d75805f088b4be17a3308dc1b7ea4.1477571498.git.hns@goldelico.com/T/
Signed-off-by: Christian Kohlschütter <christian@kohlschutter.com>
Link: https://lore.kernel.org/r/20220820131420.16608-1-christian@kohlschutter.com
Signed-off-by: Mark Brown <broonie@kernel.org>