ARM: imx: Remove unused include of linux/irqchip/arm-gic.h

linux/irqchip/arm-gic.h is NOT used at all, no need to include it.

Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>