leds: leds-lp55xx: Generalize probe/remove functions

Now that stop_all_engine is generalized, probe and remove function are
the same across every lp55xx based LED driver and can be generalized.

To permit to use a common probe, make use of the OF match_data and i2c
driver_data value to store the device_config struct specific for the
LED.

Also drop the now unused exported symbol in lp55xx-common and make them
static.

Update any lp55xx based LED driver to use the new generic probe/remove.

Suggested-by: Lee Jones <[email protected]>
Signed-off-by: Christian Marangi <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Lee Jones <[email protected]>

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