irqchip/bcm2712-mip: Fix section mismatch

irqchip/bcm2712-mip: Fix section mismatch

[ Upstream commit a8452d1d59d46066051e676d5daa472cd08cb304 ]

Platform drivers can be probed after their init sections have been
discarded so the irqchip init callback must not live in init.

Fixes: 32c6c054661a ("irqchip: Add Broadcom BCM2712 MSI-X interrupt controller")
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>