If GENERIC_UDELAY is selected don't try to use UDELAY_IO as there will be a udelay() conflict at link time. BUG=b:72378235,b:72170796 Change-Id: I9e01c9daddd0629ecc38a809889b39a505c0e203 Signed-off-by: Aaron Durbin <adurbin@chromium.org> Reviewed-on: https://review.coreboot.org/23422 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Martin Roth <martinroth@google.com> Reviewed-by: Justin TerAvest <teravest@chromium.org> Reviewed-by: Furquan Shaikh <furquan@google.com>