core: [Fix] PCI limit in add watchdog

The method checkPciAndIdeLimit didn't account for the watchdog, so the
limit number could be exceeded. This change fixes this behaviour.

Change-Id: Id6b8fdd4b0b3a56e838c1252515b3b5391de22a9
Signed-off-by: Gustavo Pedrosa <gustavo.pedrosa@eldorado.org.br>