firewire: Use COMPILE_TEST for build testing

Stop using BROKEN as an alternative dependency for the purpose of
build testing the firewire core. The newly introduced COMPILE_TEST is
better suited for that purpose.
Signed-off-by: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>

drivers/firewire/Kconfig

 menu "IEEE 1394 (FireWire) support"
-	depends on PCI || BROKEN
+	depends on PCI || COMPILE_TEST
 	# firewire-core does not depend on PCI but is
 	# not useful without PCI controller driver