Add interrupts initialization and handling routines, also add AHB bus
error interrupt handlers for both SoCs families.
Signed-off-by: NSergey Ryazanov <ryazanov.s.a@gmail.com>
Cc: Linux MIPS <linux-mips@linux-mips.org>
Patchwork: https://patchwork.linux-mips.org/patch/8240/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>