leds: leds-lp55xx: Generalize stop_all_engine OP

In all the lp55xx based driver, we have a similar implementation of the
stop_all_engine function with the only difference of the required sleep
for the OP MODE change.

The main difference is legacy LEDs require a min of 152 us while new one
use a generic 1-2ms. The new one use a 1-2ms sleep as suggested in the
datasheet IN ALTERNATIVE to a much more robust approach by using the
newly introduced ENGINE_BUSY bit in the STATUS reg.

To better handle sleep after OP MODE change, add support for polling the
ENGINE_BUSY bit and use the legacy sleep for old LEDs.

With this change, stop_all_engine can be generalized and moved to
lp55xx-common.

To make more clear the double usage of lp55xx_reg, define a union for
additional scope of mask and shift.

Update all lp55xx based driver to use the new generalized function and
define the required bits in the device_config struct.

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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