power: supply: max17042_battery: Fix a typo in function names

It is likely that 'max10742_[un]lock_model()' functions should be
'max17042_[un]lock_model()'
(0 and 7 switched in 10742)

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>