irqchip/gic-v2m: Add const to of_device_id

[ Upstream commit c10f2f8b5d8027c1ea77f777f2d16cb9043a6c09 ]

struct of_device_id should normally be const.

Signed-off-by: Xiang wangx <wangxiang@cdjrlc.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20211209132453.25623-1-wangxiang@cdjrlc.com


Stable-dep-of: 3318dc299b07 ("irqchip/gic-v2m: Prevent use after free of gicv2m_get_fwnode()")
Signed-off-by: Sasha Levin <sashal@kernel.org>