arm64: dts: uniphier: Use GIC interrupt definitions

Use human-readable definitions for GIC interrupt type and flag, instead of
hard-coding the numbers. No functional change.

Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
Link: https://lore.kernel.org/r/20220913042321.4817-6-hayashi.kunihiko@socionext.com

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Signed-off-by: Arnd Bergmann <arnd@arndb.de>