s390x: remove s390-zipl.rom

This is an s390 boot rom which was used in s390-virtio machine.
but since commit 3538fb6f89dd9bb2e7e59de2bfad52a45321c744
"s390x: remove s390-virtio machine", this file isn't used.
The only place it is referenced in the code is an unused
define ZIPL_FILENAME.  There's also comment in hw/s390/ipl.c
which I'm modifying too, to refer to s390-ccw.img instead.

Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>

Makefile

@@ -400,7 +400,6 @@ efi-pcnet.rom efi-rtl8139.rom efi-virtio.rom \
 qemu-icon.bmp qemu_logo_no_text.svg \
 bamboo.dtb petalogix-s3adsp1800.dtb petalogix-ml605.dtb \
 multiboot.bin linuxboot.bin kvmvapic.bin \
-s390-zipl.rom \
 s390-ccw.img \
 spapr-rtas.bin slof.bin \
 palcode-clipper \

hw/s390x/ipl.c

@@ -106,7 +106,7 @@ static void s390_ipl_realize(DeviceState *dev, Error **errp)
             /* Adjust ELF start address to final location */
             ipl->bios_start_addr += fwbase;
         } else {
-            /* Try to load non-ELF file (e.g. s390-zipl.rom) */
+            /* Try to load non-ELF file (e.g. s390-ccw.img) */
             bios_size = load_image_targphys(bios_filename, ZIPL_IMAGE_START,
                                             4096);
             ipl->bios_start_addr = ZIPL_IMAGE_START;

hw/s390x/s390-virtio.c

@@ -54,7 +54,6 @@
 #endif
 
 #define MAX_BLK_DEVS                    10
-#define ZIPL_FILENAME                   "s390-zipl.rom"
 #define S390_MACHINE                    "s390-virtio"
 #define TYPE_S390_MACHINE               MACHINE_TYPE_NAME(S390_MACHINE)
 

pc-bios/README

@@ -35,10 +35,6 @@
 	10ec:8139 -> pxe-rtl8139.rom
 	1af4:1000 -> pxe-virtio.rom
 
-- The S390 zipl loader is an addition to the official IBM s390-tools
-  package. That fork is maintained in its own git repository at:
-  git://repo.or.cz/s390-tools.git
-
 - The sources for the Alpha palcode image is available from:
   git://github.com/rth7680/qemu-palcode.git