blk: Rename HAVE_BLOCK_DEVICE

This option is fact really related to SPL. For U-Boot proper we always use
driver model for block devices, so CONFIG_BLK is enabled if block devices
are in use.

It is only for SPL that we have two cases:

- SPL_BLK is enabled, in which case we use driver model and blk-uclass.c
- SPL_BLK is not enabled, in which case (if we need block devices) we must
  use blk_legacy.c

Rename the symbol to SPL_LEGACY_BLOCK to make this clear. This is
different enough from BLK and SPL_BLK that there should be no confusion.

Signed-off-by: Simon Glass <sjg@chromium.org>

lib/efi_loader/Kconfig

@@ -20,7 +20,7 @@ config EFI_LOADER
 	select EVENT_DYNAMIC
 	select LIB_UUID
 	imply PARTITION_UUIDS
-	select HAVE_BLOCK_DEVICE
+	select SPL_LEGACY_BLOCK
 	select REGEX
 	imply FAT
 	imply FAT_WRITE