tests/qtest: Fix boot-serial-test when using --without-default-devices

If "configure" has been run with "--without-default-devices", there is
no e1000 device in the binaries, so the boot-serial-test currently fails
in that case since it tries to use the e1000 with the sam460ex machine.

Since we're testing the serial output here, and not the NIC, let's
simply switch to the "pci-bridge" device here instead, which should
always be there for PCI-based machines like the sam460ex.

Message-ID: <20240219111030.384158-1-thuth@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
1 file changed