irqchip: Prepare for local stub header removal

The IRQCHIP_DECLARE macro moved to to 'include/linux/irqchip.h', so
the local irqchip.h became an empty shell, which solely includes
include/linux/irqchip.h

Include the global header in all irqchip drivers instead of the local
header, so we can remove it.

Signed-off-by: Joel Porquet <joel@porquet.org>
Cc: vgupta@synopsys.com
Cc: monstr@monstr.eu
Cc: ralf@linux-mips.org
Cc: jason@lakedaemon.net
Link: http://lkml.kernel.org/r/1882096.X39jVG8e0D@joel-zenbook
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

drivers/irqchip/irq-renesas-h8300h.c

@@ -11,8 +11,6 @@
 #include <linux/of_irq.h>
 #include <asm/io.h>
 
-#include "irqchip.h"
-
 static const char ipr_bit[] = {
 	 7,  6,  5,  5,
 	 4,  4,  4,  4,  3,  3,  3,  3,