build: Add support for LimeSuite device backend

Change-Id: I239e1b37263a62b374d84974c9347e3654072e87
diff --git a/Transceiver52M/device/Makefile.am b/Transceiver52M/device/Makefile.am
index 2788eaa..1a2d077 100644
--- a/Transceiver52M/device/Makefile.am
+++ b/Transceiver52M/device/Makefile.am
@@ -11,3 +11,7 @@
 if DEVICE_UHD
 SUBDIRS += uhd
 endif
+
+if DEVICE_LMS
+SUBDIRS += lms
+endif