sh: eliminate unused irq_reg_{readl,writel} accessors

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 <[email protected]>
Signed-off-by: Geert Uytterhoeven <[email protected]>
Tested-by: Geert Uytterhoeven <[email protected]> (cpp/asm comparison)
Cc: Thomas Gleixner <[email protected]>
Cc: Jason Cooper <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>