regulator: core: Add regulator_is_equal() helper

Add regulator_is_equal() helper to compare whether two regulators are
the same. This is useful for checking whether two separate regulators
in a driver are actually the same supply.

Signed-off-by: Marek Vasut <[email protected]>
Cc: Fabio Estevam <[email protected]>
Cc: Igor Opaniuk <[email protected]>
Cc: Liam Girdwood <[email protected]>
Cc: Marcel Ziswiler <[email protected]>
Cc: Mark Brown <[email protected]>
Cc: Oleksandr Suvorov <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>

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