ahci: Fix CD-ROM signature

The CD-ROM signature is 0xeb140101, not 0xeb140000.
Without this change OVMF/Duet runs into a timeout trying
to detect a SATA cdrom.
Signed-off-by: NHannes Reinecke <hare@suse.de>
Signed-off-by: NJohn Snow <jsnow@redhat.com>
Reviewed-by: NKevin Wolf <kwolf@redhat.com>
Message-id: 1436219392-31915-2-git-send-email-jsnow@redhat.com

hw/ide/ahci.h

@@ -166,7 +166,7 @@
 #define AHCI_CMD_HDR_CMD_FIS_LEN           0x1f
 #define AHCI_CMD_HDR_PRDT_LEN              16
 
-#define SATA_SIGNATURE_CDROM               0xeb140000
+#define SATA_SIGNATURE_CDROM               0xeb140101
 #define SATA_SIGNATURE_DISK                0x00000101
 
 #define AHCI_GENERIC_HOST_CONTROL_REGS_MAX_ADDR 0x20