soc: st: Add STM32MP2 SYSCFG driver

Add trivial SYSCFG driver for ST STM32MP25xx, which binds drivers
to its subnodes. This is currently used to bind USB PHY drivers to
subnodes described in the SYS

soc: st: Add STM32MP2 SYSCFG driver

Add trivial SYSCFG driver for ST STM32MP25xx, which binds drivers
to its subnodes. This is currently used to bind USB PHY drivers to
subnodes described in the SYSCFG DT node.

Signed-off-by: Marek Vasut <marex@nabladev.com>
Tested-by: Fabrice Gasnier <fabrice.gasnier@foss.st.com>
Acked-by: Fabrice Gasnier <fabrice.gasnier@foss.st.com>
Link: https://lore.kernel.org/r/20260902124018.606544-2-marex@nabladev.com
Signed-off-by: Alexandre Torgue <alexandre.torgue@foss.st.com>

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