Revert "env: net: Move eth_parse_enetaddr() to net.c/h"

The reverted patch causes linking error with disabled CONFIG_NET:

  cmd/built-in.o: In function `eth_env_get_enetaddr':
  u-boot-v2019.10/cmd/nvedit.c:363: undefined reference to `eth_parse_enetaddr'

Function setup_environment() in board/sunxi/board.c calls
eth_env_set_enetaddr() to setup stable mac address for ethernet interfaces.

This needs to be implemented and succeed even if net is disabled in u-boot,
as it ensures Linux will not generate random MAC addresses, and picks the
ones provided by u-boot via DT. See fdt_fixup_ethernet().

This feature is independent of the whole network stack and network drivers
in u-boot.

This revert fixes the linking error.

Signed-off-by: Ondrej Jirman <megous@megous.com>

include/env.h

@@ -332,4 +332,15 @@ int env_get_char(int index);
  */
 void env_reloc(void);
 
+/**
+ * eth_parse_enetaddr() - Parse a MAC address
+ *
+ * Convert a string MAC address
+ *
+ * @addr: MAC address in aa:bb:cc:dd:ee:ff format, where each part is a 2-digit
+ *	hex value
+ * @enetaddr: Place to put MAC address (6 bytes)
+ */
+void eth_parse_enetaddr(const char *addr, uint8_t *enetaddr);
+
 #endif