env: Add support for storing env variables in SCSI devices

Allow SCSI to be able to store environment variables.

Signed-off-by: Varadarajan Narayanan <quic_varada@quicinc.com>
Acked-by: Casey Connolly <casey.connolly@linaro.org>
diff --git a/include/env_internal.h b/include/env_internal.h
index ee939ba..75b46d0 100644
--- a/include/env_internal.h
+++ b/include/env_internal.h
@@ -115,6 +115,7 @@
 	ENVL_SPI_FLASH,
 	ENVL_MTD,
 	ENVL_UBI,
+	ENVL_SCSI,
 	ENVL_NOWHERE,
 
 	ENVL_COUNT,