MIPS: Remove unnecessary inclusions of linux/irqchip/mips-gic.h

MIPS: Remove unnecessary inclusions of linux/irqchip/mips-gic.h

linux/irqchip/mips-gic.h is included in a few files that don't actually
use it at all. Remove these unnecessary inclusions in preparation for
removing the header.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/17048/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>