irqchip/renesas-rzg2l: Fix section mismatch

irqchip/renesas-rzg2l: Fix section mismatch

[ Upstream commit 5b338fbb2b5b21d61a9eaba14dcf43108de30258 ]

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

Fixes: d011c022efe27579 ("irqchip/renesas-rzg2l: Add support for RZ/Five SoC")
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Sasha Levin <sashal@kernel.org>