leds: lp8860: Hold lock for all of EEPROM programming

leds: lp8860: Hold lock for all of EEPROM programming

The lock is taken while unlocking the EEPROM but then released, it should
instead be held for the whole EEPROM programming process. To do this
merge in the lp8860_unlock_eeprom() function to the only call site in
the lp8860_init() function. This way we hold the lock for all steps.
While here, rename this function to lp8860_program_eeprom() to better
represent what it really does.

Signed-off-by: Andrew Davis <afd@ti.com>
Link: https://patch.msgid.link/20260305203706.841384-3-afd@ti.com
Signed-off-by: Lee Jones <lee@kernel.org>