Kconfig: Add SPI / SPI_FLASH as dependencies

In order to use CMD_SF / CMD_SPI / ENV_IS_IN_SPI_FLASH we need to have
the SPI (or SPI_FLASH/DM_SPI_FLASH, for CMD_SF) enabled.  Express this
in the Kconfigs.

Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Jagan Teki <jagan@amarulasolutions.com>
diff --git a/env/Kconfig b/env/Kconfig
index 1e10c7a..9320816 100644
--- a/env/Kconfig
+++ b/env/Kconfig
@@ -293,7 +293,7 @@
 
 config ENV_IS_IN_SPI_FLASH
 	bool "Environment is in SPI flash"
-	depends on !CHAIN_OF_TRUST
+	depends on !CHAIN_OF_TRUST && SPI
 	default y if ARMADA_XP
 	default y if INTEL_BAYTRAIL
 	default y if INTEL_BRASWELL