Revert "megasas: disable due to build breakage"

This reverts commit 92336855.
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

default-configs/pci.mak

@@ -10,6 +10,7 @@ CONFIG_EEPRO100_PCI=y
 CONFIG_PCNET_PCI=y
 CONFIG_PCNET_COMMON=y
 CONFIG_LSI_SCSI_PCI=y
+CONFIG_MEGASAS_SCSI_PCI=y
 CONFIG_RTL8139_PCI=y
 CONFIG_E1000_PCI=y
 CONFIG_IDE_CORE=y