power: supply: max1721x: Correct spelling

Change  'stanalone'      to  'standalone'
Change  'mesaurement'    to  'measurement'
Change  'nonvilatile'    to  'nonvolatile'
Change  'unical'         to  'unique'
Change  'unaccesable'    to  'unaccessible'
Change  'correcpondent'  to  'correspond'

Signed-off-by: Xiaofeng Cao <caoxiaofeng@yulong.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>