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>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index d812685..6009b7d 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -1133,7 +1133,6 @@
 	select DM_SPI_FLASH if SPI
 	select DM_KEYBOARD
 	select DM_MMC if MMC
-	select DM_SCSI if SCSI
 	select DM_SERIAL
 	select OF_BOARD_SETUP
 	select OF_CONTROL
@@ -1838,7 +1837,7 @@
 	select PCI
 	select DM_RNG
 	select DM_RTC
-	select DM_SCSI
+	select SCSI
 	select DM_SERIAL
 	select DM_SPI
 	select GPIO_EXTRA_HEADER
@@ -2053,7 +2052,6 @@
 	select PCI
 	select DM_PCI
 	select SCSI
-	select DM_SCSI
 	select DM_SERIAL
 	imply CMD_PCI
 	help