device/lms: fix: 'trx_vty.h' header requires C linkage

Otherwise, the linker fails to produce osmo-trx-lms binary:

  LMSDevice.cpp:493: undefined reference to
    `get_value_string(value_string const*, unsigned int)'

  LMSDevice.cpp:237: undefined reference to
    `osmo_panic(char const*, ...)'

Change-Id: I2fef166c13136af7b7aaa744d39427d76ad11769
Fixes: OS#4828

Transceiver52M/device/lms/LMSDevice.cpp

@@ -23,7 +23,6 @@
 
 #include <map>
 
-#include "trx_vty.h"
 #include "Logger.h"
 #include "Threads.h"
 #include "LMSDevice.h"
@@ -32,6 +31,7 @@
 #include <lime/LimeSuite.h>
 
 extern "C" {
+#include "trx_vty.h"
 #include "osmo_signal.h"
 #include <osmocom/core/utils.h>
 }