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/pcap.c

@@ -48,7 +48,7 @@ static int do_pcap_clear(struct cmd_tbl *cmdtp, int flag, int argc,
 	return pcap_clear() ? CMD_RET_FAILURE : CMD_RET_SUCCESS;
 }
 
-static char pcap_help_text[] =
+U_BOOT_LONGHELP(pcap,
 	"- network packet capture\n\n"
 	"pcap\n"
 	"pcap init\t\t\t<addr> <max_size>\n"
@@ -60,7 +60,7 @@ static char pcap_help_text[] =
 	"With:\n"
 	"\t<addr>: user address to which pcap will be stored (hexedcimal)\n"
 	"\t<max_size>: Maximum size of pcap file (decimal)\n"
-	"\n";
+	"\n");
 
 U_BOOT_CMD_WITH_SUBCMDS(pcap, "pcap", pcap_help_text,
 			U_BOOT_SUBCMD_MKENT(init, 3, 0, do_pcap_init),