MIPS: JZ4740: use generic plat_irq_dispatch

Make use of the generic plat_irq_dispatch function introduced by commit
85f7cdacbb81 "MIPS: Provide a generic plat_irq_dispatch", in order to
reduce unnecessary code duplication.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: Lars-Peter Clausen <lars@metafoo.de>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Cc: Brian Norris <computersforpeace@gmail.com>
Patchwork: https://patchwork.linux-mips.org/patch/10138/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/jz4740/irq.c

@@ -27,7 +27,6 @@
 #include <linux/seq_file.h>
 
 #include <asm/io.h>
-#include <asm/mipsregs.h>
 
 #include <asm/mach-jz4740/base.h>
 #include <asm/mach-jz4740/irq.h>
@@ -111,17 +110,6 @@ void __init arch_init_irq(void)
 	setup_irq(2, &jz4740_cascade_action);
 }
 
-asmlinkage void plat_irq_dispatch(void)
-{
-	unsigned int pending = read_c0_status() & read_c0_cause() & ST0_IM;
-	if (pending & STATUSF_IP2)
-		do_IRQ(2);
-	else if (pending & STATUSF_IP3)
-		do_IRQ(3);
-	else
-		spurious_interrupt();
-}
-
 #ifdef CONFIG_DEBUG_FS
 
 static inline void intc_seq_reg(struct seq_file *s, const char *name,