arch: x86: Restrict direct IPI support

It has been discovered that direct IPI support does not work
correctly when CONFIG_X2APIC is enabled. Until that can be
fixed, restrict this feature on x86 to platforms that do not
enable CONFIG_X2APIC.

Fixes #87046

Signed-off-by: Peter Mitsis <peter.mitsis@intel.com>
1 file changed