versal: Return ENVL_NOWHERE instead of ENVL_UNKNOWN

The system fails to boot without any environment location, so return
ENVL_NOWHERE when there's nowhere to store the environment instead
of ENVL_UNKNOWN.

The same change was also done by commit 50918d0df5cb ("xilinx: Return
ENVL_NOWHERE instead of ENVL_UNKNOWN") for zynq and zynqmp.

Signed-off-by: T Karthik Reddy <t.karthik.reddy@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Link: https://lore.kernel.org/r/e4ed36408f10159677ed8060bfd5289f3e0691fa.1637752614.git.michal.simek@xilinx.com
diff --git a/board/xilinx/versal/board.c b/board/xilinx/versal/board.c
index 03604d7..299e128 100644
--- a/board/xilinx/versal/board.c
+++ b/board/xilinx/versal/board.c
@@ -269,13 +269,13 @@
 			return ENVL_FAT;
 		if (IS_ENABLED(CONFIG_ENV_IS_IN_EXT4))
 			return ENVL_EXT4;
-		return ENVL_UNKNOWN;
+		return ENVL_NOWHERE;
 	case OSPI_MODE:
 	case QSPI_MODE_24BIT:
 	case QSPI_MODE_32BIT:
 		if (IS_ENABLED(CONFIG_ENV_IS_IN_SPI_FLASH))
 			return ENVL_SPI_FLASH;
-		return ENVL_UNKNOWN;
+		return ENVL_NOWHERE;
 	case JTAG_MODE:
 	default:
 		return ENVL_NOWHERE;