regulator: fan53555: Fix slew_shift setting for tcs4525

Fix trivial copy-paste mistake.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Link: https://lore.kernel.org/r/20210517010318.1027949-1-axel.lin@ingics.com


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