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>
diff --git a/board/xilinx/zynq/cmds.c b/board/xilinx/zynq/cmds.c
index 024fac6..d7c7b2f 100644
--- a/board/xilinx/zynq/cmds.c
+++ b/board/xilinx/zynq/cmds.c
@@ -527,8 +527,7 @@
 	return cmd_process_error(zynq_cmd, ret);
 }
 
-#ifdef CONFIG_SYS_LONGHELP
-static char zynq_help_text[] =
+U_BOOT_LONGHELP(zynq,
 	""
 #ifdef CONFIG_CMD_ZYNQ_RSA
 	"rsa <baseaddr>  - Verifies the authenticated and encrypted\n"
@@ -545,8 +544,7 @@
 	"       if operation type is load or loadp, it loads the encrypted\n"
 	"       full or partial bitstream on to PL respectively.\n"
 #endif
-	;
-#endif
+	);
 
 U_BOOT_CMD(zynq,	6,	0,	do_zynq,
 	   "Zynq specific commands", zynq_help_text