pwr-mlxbf: extend Kconfig to include gpio-mlxbf3 dependency

pwr-mlxbf: extend Kconfig to include gpio-mlxbf3 dependency

The BlueField power handling driver (pwr-mlxbf.c) provides
functionality for both BlueField-2 and BlueField-3 based
platforms.  This driver also depends on the SoC-specific
BlueField GPIO driver, whether gpio-mlxbf2 or gpio-mlxbf3.
This patch extends the Kconfig definition to include the
dependency on the gpio-mlxbf3 driver, if applicable.

Signed-off-by: David Thompson <davthompson@nvidia.com>
Reviewed-by: Asmaa Mnebhi <asmaa@nvidia.com>
Link: https://lore.kernel.org/r/20230823133743.31275-1-davthompson@nvidia.com
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>