strings cmd: drop old CONFIG_CFG_STRINGS define

We don't need CONFIG_CFG_STRINGS anymore now that we have the define
CONFIG_CMD_STRINGS and Makefile control.
Signed-off-by: NMike Frysinger <vapier@gentoo.org>

common/cmd_strings.c

@@ -10,8 +10,6 @@
 #include <common.h>
 #include <command.h>
 
-#ifdef CONFIG_CFG_STRINGS
-
 static char *start_addr, *last_addr;
 
 int do_strings(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
@@ -45,5 +43,3 @@ U_BOOT_CMD(strings, 3, 1, do_strings,
 	"strings - display strings\n",
 	"<addr> [byte count]\n"
 	"    - display strings at <addr> for at least [byte count] or first double NUL\n");
-
-#endif