Prevent a reboot loop due to slow PCIe init. Poke the watchdog a few times. Change-Id: I03739d7dbad3072ccf77364fa4caba42c66ac643 Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com> Reviewed-on: https://review.coreboot.org/27455 Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@gmail.com> Tested-by: build bot (Jenkins) <no-reply@coreboot.org>