scsi: Forceably finish migration to DM_SCSI

The migration deadline for moving to DM_SCSI was v2023.04. A further
reminder was sent out in August 2023 to the remaining platforms that had
not migrated already, and that a few more over the line (or configs
deleted).

With this commit we:
- Rename CONFIG_DM_SCSI to CONFIG_SCSI.
- Remove all of the non-DM SCSI code. This includes removing other
  legacy symbols and code and removes some legacy non-DM AHCI code.
- Some platforms that had previously been DM_SCSI=y && SCSI=n are now
  fully migrated to DM_SCSI as a few corner cases in the code assumed
  DM_SCSI=y meant SCSI=y.

Signed-off-by: Tom Rini <trini@konsulko.com>

api/api_storage.c

@@ -67,13 +67,6 @@ void dev_stor_init(void)
 	specs[ENUM_SATA].type = DEV_TYP_STOR | DT_STOR_SATA;
 	specs[ENUM_SATA].name = "sata";
 #endif
-#if defined(CONFIG_SCSI)
-	specs[ENUM_SCSI].max_dev = SCSI_MAX_DEVICE;
-	specs[ENUM_SCSI].enum_started = 0;
-	specs[ENUM_SCSI].enum_ended = 0;
-	specs[ENUM_SCSI].type = DEV_TYP_STOR | DT_STOR_SCSI;
-	specs[ENUM_SCSI].name = "scsi";
-#endif
 #if defined(CONFIG_CMD_USB) && defined(CONFIG_USB_STORAGE)
 	specs[ENUM_USB].max_dev = USB_MAX_STOR_DEV;
 	specs[ENUM_USB].enum_started = 0;