Add Ingenic JZ4760 and X1000 and X1500 irqchip support v3.

From: Zhou Yanjie
Date: Mon Jul 15 2019 - 08:10:28 EST


v1->v2: Replace "__fls(pending)" with "bit" in function "generic_handle_irq".
v2->v3: Add support for probing irq-ingenic driver on JZ4760 and X1500 Soc.