pci-host: update obsolete reference about piix_pci.c

piix_pci.c has been renamed into piix.c at commit
c0907c9e

update the obsolete reference.
Signed-off-by: NGonglei <arei.gonglei@huawei.com>
Signed-off-by: NMichael Tokarev <mjt@tls.msk.ru>

hw/isa/lpc_ich9.c

@@ -7,7 +7,7 @@
  *               VA Linux Systems Japan K.K.
  * Copyright (C) 2012 Jason Baron <jbaron@redhat.com>
  *
- * This is based on piix_pci.c, but heavily modified.
+ * This is based on piix.c, but heavily modified.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal

hw/pci-host/pam.c

@@ -6,7 +6,7 @@
  *                    VA Linux Systems Japan K.K.
  * Copyright (c) 2012 Jason Baron <jbaron@redhat.com>
  *
- * Split out from piix_pci.c
+ * Split out from piix.c
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal

hw/pci-host/q35.c

@@ -7,7 +7,7 @@
  *               VA Linux Systems Japan K.K.
  * Copyright (C) 2012 Jason Baron <jbaron@redhat.com>
  *
- * This is based on piix_pci.c, but heavily modified.
+ * This is based on piix.c, but heavily modified.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal

include/hw/pci-host/pam.h

@@ -7,7 +7,7 @@
  *               VA Linux Systems Japan K.K.
  * Copyright (c) 2012 Jason Baron <jbaron@redhat.com>
  *
- * Split out from piix_pci.c
+ * Split out from piix.c
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal