gpio/Kconfig: Fix X86 arch name
gpio/Kconfig: Fix X86 arch name

X86 Kconfig symbol is X86, not ARCH_X86.

Fixes: c586b3075d5b47d8 (gpio/xilinx: Add support for X86 Arch)
Reported-by: Paul Bolle <0bda9a89324ffe2d19adec61a9f1cd9f8c8e45f0@tiscali.nl>
Signed-off-by: Ricardo Ribalda Delgado <39bb74b16720293e1449e36465485b27216fbd6d@gmail.com>
Signed-off-by: Linus Walleij <9cd9d802d23c0ed5e224beabf4ae4a5c478746ef@linaro.org>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs