ARM: 9103/1: Drop ARCH_NR_GPIOS definition

The conditional by the generic header is the same,
hence drop unnecessary duplication.

Link: https://lore.kernel.org/r/20210510114107.43006-1-andriy.shevchenko@linux.intel.com

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>