arm64: dts: rockchip: fix rk356x pcie msg interrupt name

[ Upstream commit 3cee9c63 ]

The expected name by the binding at this position is "msg" and the SoC's
manual also calls the interrupt in question "msg", so fix the rk356x dtsi
to use the correct name.

Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Link: https://lore.kernel.org/r/20231114153834.934978-1-heiko@sntech.de


Signed-off-by: Sasha Levin <sashal@kernel.org>