irqchip/ingenic: Add support for the JZ4760

[ Upstream commit 5fbecd23

 ]

Add support for the interrupt controller found in the JZ4760 SoC, which
works exactly like the one in the JZ4770.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20210307172014.73481-2-paul@crapouillou.net
Signed-off-by: Sasha Levin <sashal@kernel.org>