hw: move watchdogs to hw/watchdog, configure via default-configs/

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/default-configs/pci.mak b/default-configs/pci.mak
index ce56d58..f5f100e 100644
--- a/default-configs/pci.mak
+++ b/default-configs/pci.mak
@@ -23,3 +23,4 @@
 CONFIG_SERIAL=y
 CONFIG_SERIAL_PCI=y
 CONFIG_IPACK=y
+CONFIG_WDT_IB6300ESB=y