irqchip/lan966x-oic: Make CONFIG_LAN966X_OIC depend on CONFIG_MCHP_LAN966X_PCI

The Microchip LAN966x outband interrupt controller is only present on
Microchip LAN966x SoCs, and only used in PCI endpoint mode.  Hence add a
dependency on MCHP_LAN966X_PCI, to prevent asking the user about this
driver when configuring a kernel without Microchip LAN966x PCIe support.

Fixes: 3e3a7b35 ("irqchip: Add support for LAN966x OIC")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Herve Codina <herve.codina@bootlin.com>
Link: https://lore.kernel.org/all/28e8a605e72ee45e27f0d06b2b71366159a9c782.1737383314.git.geert+renesas@glider.be