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>

cmd/bootcount.c

@@ -46,16 +46,11 @@ static int do_bootcount(struct cmd_tbl *cmdtp, int flag, int argc,
 	return CMD_RET_USAGE;
 }
 
-#if IS_ENABLED(CONFIG_SYS_LONGHELP)
-static char bootcount_help_text[] =
+U_BOOT_LONGHELP(bootcount,
 	"print - print current bootcounter\n"
-	"reset - reset the bootcounter"
-	;
-#endif
+	"reset - reset the bootcounter");
 
 U_BOOT_CMD(bootcount, 2, 1, do_bootcount,
 	   "bootcount",
-#if IS_ENABLED(CONFIG_SYS_LONGHELP)
 	   bootcount_help_text
-#endif
 );