leds: lm36274: do not set chip settings in DT parsing function

These settings are not parsed from DT and therefore semantically should
not be set in function with a name lm36274_parse_dt.

Signed-off-by: Marek Behún <marek.behun@nic.cz>
Tested-by: Dan Murphy <dmurphy@ti.com>
Signed-off-by: Pavel Machek <pavel@ucw.cz>