arch/x86: Move cpu_relax()

It's not related to spinlocks and the actual implementation
was also guarded by CONFIG(SMP).

With a single call-site in x86-specific code, empty stubs
for other arch are currently not necessary.

Also drop an unused included on a nearby line.

Change-Id: I00439e9c1d10c943ab5e404f5d687d316768fa16
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/43808
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

0 files changed, 0 insertions, 0 deletions