leds: lm3532: Fixes for the driver for stability

Fixed misspelled words, added error check during probe
on the init of the registers, and fixed ALS/I2C control
mode.

Fixes: bc1b8492 ("leds: lm3532: Introduce the lm3532 LED driver")
Reported-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Dan Murphy <dmurphy@ti.com>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>