env: Fix network support when CONFIG_NET_LWIP is set

When lwIP (CONFIG_NET_LWIP) is used instead of legacy stack (CONFIG_NET),
environment flags support associated with network was not built: restore
support of "i" and "m" environment flags.

Signed-off-by: Benjamin ROBIN <dev@benjarobin.fr>
Acked-by: Jerome Forissier <jerome.forissier@linaro.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/include/env_callback.h b/include/env_callback.h
index 47a31f6..918ccb3 100644
--- a/include/env_callback.h
+++ b/include/env_callback.h
@@ -32,7 +32,7 @@
 #define DNS_CALLBACK
 #endif
 
-#ifdef CONFIG_NET
+#if CONFIG_IS_ENABLED(NET) || CONFIG_IS_ENABLED(NET_LWIP)
 #define NET_CALLBACKS \
 	"bootfile:bootfile," \
 	"ipaddr:ipaddr," \
diff --git a/include/env_flags.h b/include/env_flags.h
index 2476043..92c7ea8 100644
--- a/include/env_flags.h
+++ b/include/env_flags.h
@@ -14,7 +14,7 @@
 	env_flags_vartype_decimal,
 	env_flags_vartype_hex,
 	env_flags_vartype_bool,
-#ifdef CONFIG_NET
+#if CONFIG_IS_ENABLED(NET) || CONFIG_IS_ENABLED(NET_LWIP)
 	env_flags_vartype_ipaddr,
 	env_flags_vartype_macaddr,
 #endif
@@ -41,7 +41,7 @@
 #define CFG_ENV_FLAGS_LIST_STATIC ""
 #endif
 
-#ifdef CONFIG_NET
+#if CONFIG_IS_ENABLED(NET) || CONFIG_IS_ENABLED(NET_LWIP)
 #ifdef CONFIG_REGEX
 #define ETHADDR_WILDCARD "\\d*"
 #else
@@ -123,7 +123,7 @@
  */
 enum env_flags_varaccess env_flags_parse_varaccess_from_binflags(int binflags);
 
-#ifdef CONFIG_NET
+#if CONFIG_IS_ENABLED(NET) || CONFIG_IS_ENABLED(NET_LWIP)
 /*
  * Check if a string has the format of an Ethernet MAC address
  */