leds-lp55xx: use common device attribute driver function
lp5521/5523_register_sysfs() are replaced with lp55xx common driver function, lp55xx_register_sysfs(). Chip specific device attributes are configurable using 'dev_attr_group'. Error condition name is changed: use specific error condition, 'err_register_sysfs' rather than unclear name, 'fail2'. Signed-off-by: NMilo(Woogyom) Kim <milo.kim@ti.com> Signed-off-by: NBryan Wu <cooloney@gmail.com>
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