cmd: Convert existing long help messages to the new macro

- Generally we just drop the #ifdef CONFIG_SYS_LONGHELP and endif lines
  and use U_BOOT_LONGHELP to declare the same variable name as before
- In a few places, either rename the variable to follow convention or
  introduce the variable as it was being done inline before.

Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

test/fuzz/cmd_fuzz.c

@@ -70,11 +70,8 @@ static int do_fuzz(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[]
 	return 1;
 }
 
-#ifdef CONFIG_SYS_LONGHELP
-static char fuzz_help_text[] =
-	"[fuzz-test-name] - execute the named fuzz test\n"
-	;
-#endif /* CONFIG_SYS_LONGHELP */
+U_BOOT_LONGHELP(fuzz,
+	"[fuzz-test-name] - execute the named fuzz test\n");
 
 U_BOOT_CMD(
 	fuzz, CONFIG_SYS_MAXARGS, 1, do_fuzz,