sh: eliminate unused irq_reg_{readl,writel} accessors

Defining these macros way down in arch/sh/.../irq.c doesn't cause
kernel/irq/generic-chip.c to use them.  As far as I can tell this code has
no effect.

Fixes: 332fd7c4fef5f3b1 ("genirq: Generic chip: Change irq_reg_{readl,writel} arguments")
Signed-off-by: Kevin Cernekee <cernekee@gmail.com>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Tested-by: Geert Uytterhoeven <geert+renesas@glider.be> (cpp/asm comparison)
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Jason Cooper <jason@lakedaemon.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/sh/boards/mach-se/7343/irq.c

@@ -14,9 +14,6 @@
 #define DRV_NAME "SE7343-FPGA"
 #define pr_fmt(fmt) DRV_NAME ": " fmt
 
-#define irq_reg_readl	ioread16
-#define irq_reg_writel	iowrite16
-
 #include <linux/init.h>
 #include <linux/irq.h>
 #include <linux/interrupt.h>

arch/sh/boards/mach-se/7722/irq.c

@@ -11,9 +11,6 @@
 #define DRV_NAME "SE7722-FPGA"
 #define pr_fmt(fmt) DRV_NAME ": " fmt
 
-#define irq_reg_readl	ioread16
-#define irq_reg_writel	iowrite16
-
 #include <linux/init.h>
 #include <linux/irq.h>
 #include <linux/interrupt.h>