rng-tools: Fix disabling package on non-x86 architectures.

rng-tools: Fix disabling package on non-x86 architectures.

Commit 2f89476 ("package/libgpg-error: bump to version 1.23") introduced
a BR2_PACKAGE_LIBGPG_ERROR_ARCH_SUPPORTS which was added as a dependency
to all libgpg-error reverse dependencies.

However, rng-tools only select libgpg-error if BR2_i386 || BR2_x86_64
(for RDRAND) but the rng-tools dependency was added as
BR2_PACKAGE_LIBGPG_ERROR_ARCH_SUPPORTS && (BR2_i386 || BR2_x86_64),
Therefore limiting rng-tools to the x86 architecture.

This patch changes it as ..._ARCH_SUPPORT || !(BR2_i386 || BR2_x86_64).

Signed-off-by: Nicolas Cavallari <nicolas.cavallari@green-communications.fr>
Reviewed-by: Romain Naour <romain.naour@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>