Retype the `pcie_port_coalesce` devicetree options and related variables to better reflect their bivalue (boolean) nature. Change-Id: I6a4dfe277a8f83a9eb58515fc4eaa2fee0747ddb Signed-off-by: Angel Pons <th3fanbus@gmail.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/60416 Reviewed-by: Felix Held <felix-coreboot@felixheld.de> Reviewed-by: Felix Singer <felixsinger@posteo.net> Tested-by: build bot (Jenkins) <no-reply@coreboot.org>