ARM: fix warning: 'print_eth' defined but not used

This warning got issued for all ARM systems that don't have
CONFIG_CMD_NET enabled.

Signed-off-by: Wolfgang Denk <wd@denx.de>

common/cmd_bdinfo.c

@@ -31,7 +31,9 @@ DECLARE_GLOBAL_DATA_PTR;
 
 static void print_num(const char *, ulong);
 
+#if !defined(CONFIG_ARM) || defined(CONFIG_CMD_NET)
 static void print_eth(int idx);
+#endif
 
 #ifndef CONFIG_ARM	/* PowerPC and other */
 static void print_lnum(const char *, u64);
@@ -347,6 +349,7 @@ static void print_num(const char *name, ulong value)
 	printf ("%-12s= 0x%08lX\n", name, value);
 }
 
+#if !defined(CONFIG_ARM) || defined(CONFIG_CMD_NET)
 static void print_eth(int idx)
 {
 	char name[10], *val;
@@ -359,6 +362,7 @@ static void print_eth(int idx)
 		val = "(not set)";
 	printf("%-12s= %s\n", name, val);
 }
+#endif
 
 #ifndef CONFIG_ARM
 static void print_lnum(const char *name, u64 value)