remove arch/arm/mach-as9260

Signed-off-by: Oleksij Rempel <linux@rempel-privat.de>
arch/arm/boot/dts/asm9260.dtsi

Signed-off-by: Oleksij Rempel <linux@rempel-privat.de>
arch/arm/mach-asm9260/core.c

Signed-off-by: Oleksij Rempel <linux@rempel-privat.de>
arch/arm/mach-asm9260/timer.c

Signed-off-by: Oleksij Rempel <linux@rempel-privat.de>
drivers/irqchip/irq-asm9260.c

Signed-off-by: Oleksij Rempel <linux@rempel-privat.de>