MIPS: BMIPS: Delete the irqchip driver from irq.c

BCM3384/BCM63xx can use the common drivers/irqchip/irq-bcm7120-l2.c for
this purpose; BCM7xxx will use drivers/irqchip/irq-bcm7038-l1.c.  We no
longer need this code under arch/mips.

[ralf@linux-mips.org: Fix conflicts.]

Signed-off-by: Kevin Cernekee <cernekee@gmail.com>
Cc: f.fainelli@gmail.com
Cc: jaedon.shin@gmail.com
Cc: abrestic@chromium.org
Cc: tglx@linutronix.de
Cc: jason@lakedaemon.net
Cc: jogo@openwrt.org
Cc: arnd@arndb.de
Cc: computersforpeace@gmail.com
Cc: linux-mips@linux-mips.org
Cc: devicetree@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/8853/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

Documentation/devicetree/bindings/mips/brcm/bcm3384-intc.txt

@@ -1,37 +0,0 @@
-* Interrupt Controller
-
-Properties:
-- compatible: "brcm,bcm3384-intc"
-
-  Compatibility with BCM3384 and possibly other BCM33xx/BCM63xx SoCs.
-
-- reg: Address/length pairs for each mask/status register set.  Length must
-  be 8.  If multiple register sets are specified, the first set will
-  handle IRQ offsets 0..31, the second set 32..63, and so on.
-
-- interrupt-controller: This is an interrupt controller.
-
-- #interrupt-cells: Must be <1>.  Just a simple IRQ offset; no level/edge
-  or polarity configuration is possible with this controller.
-
-- interrupt-parent: This controller is cascaded from a MIPS CPU HW IRQ, or
-  from another INTC.
-
-- interrupts: The IRQ on the parent controller.
-
-Example:
-	periph_intc: periph_intc@14e00038 {
-		compatible = "brcm,bcm3384-intc";
-
-		/*
-		 * IRQs 0..31:  mask reg 0x14e00038, status reg 0x14e0003c
-		 * IRQs 32..63: mask reg 0x14e00340, status reg 0x14e00344
-		 */
-		reg = <0x14e00038 0x8 0x14e00340 0x8>;
-
-		interrupt-controller;
-		#interrupt-cells = <1>;
-
-		interrupt-parent = <&cpu_intc>;
-		interrupts = <4>;
-	};