fix disk boot

target/x86/kernel/qemu-i686

@@ -10,6 +10,9 @@ CONFIG_SCSI=y
 CONFIG_SCSI_DMA=y
 CONFIG_BLK_DEV_SD=y
 CONFIG_ATA=y
+CONFIG_SATA_PMP=y
+CONFIG_ATA_SFF=y
+CONFIG_ATA_BMDMA=y
 CONFIG_ATA_PIIX=y
 CONFIG_NETDEVICES=y
 CONFIG_NET_CORE=y