irqchip/irq-bcm7038-l1: Fix section mismatch

irqchip/irq-bcm7038-l1: Fix section mismatch

[ Upstream commit e9db5332caaf4789ae3bafe72f61ad8e6e0c2d81 ]

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

Fixes: c057c799e379 ("irqchip/irq-bcm7038-l1: Switch to IRQCHIP_PLATFORM_DRIVER")
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>