imx: aristainetos: enable U-Boot Environment variables protection

enable Environment protection with:

CONFIG_ENV_APPEND=y
CONFIG_ENV_WRITEABLE_LIST=y
CONFIG_ENV_ACCESS_IGNORE_FORCE

and add board specific env_get_location()
function.

Signed-off-by: Heiko Schocher <hs@denx.de>

board/aristainetos/aristainetos.c

@@ -27,6 +27,7 @@
 #include <bmp_logo.h>
 #include <dm/root.h>
 #include <env.h>
+#include <env_internal.h>
 #include <i2c_eeprom.h>
 #include <i2c.h>
 #include <micrel.h>
@@ -527,3 +528,22 @@ int embedded_dtb_select(void)
 	return 0;
 }
 #endif
+
+enum env_location env_get_location(enum env_operation op, int prio)
+{
+	if (op == ENVOP_SAVE || op == ENVOP_ERASE)
+		return ENVL_SPI_FLASH;
+
+	switch (prio) {
+	case 0:
+		return ENVL_NOWHERE;
+
+	case 1:
+		return ENVL_SPI_FLASH;
+
+	default:
+		return ENVL_UNKNOWN;
+	}
+
+	return ENVL_UNKNOWN;
+}