Update some copyright stuff

src/burn/devices/c169.cpp

@@ -1,3 +1,5 @@
+// Based on MAME sources by Phil Stroffolino
+
 #include "tiles_generic.h"
 
 static UINT32 size;

src/burn/devices/namco_c45.cpp

@@ -1,3 +1,5 @@
+// Based on MAME sources by Phil Stroffolino, Aaron Giles, and Alex W. Jackson
+
 #include "tiles_generic.h"
 #include "m68000_intf.h"
 

src/burn/devices/watchdog.cpp

@@ -1,3 +1,5 @@
+// FB Alpha watchdog device module
+
 #include "burnint.h"
 
 static INT32 (*WatchdogReset)(INT32 clear_mem) = NULL;

src/burn/snd/c140.cpp

@@ -1,3 +1,6 @@
+// license:BSD-3-Clause
+// copyright-holders:R. Belmont
+
 /*
 C140.c
 

src/burn/snd/namco_snd.cpp

@@ -1,3 +1,5 @@
+// copyright-holders:Nicola Salmoria,Aaron Giles
+
 #include "burnint.h"
 #include "burn_sound.h"
 #include "namco_snd.h"