debian: Add cfg file examples for osmo-trx-{lms,uhd}

Sort cfg files according to their osmo-trx binary.
Install them during make install.
Add the installed cfg files to related debian packages.

Change-Id: I905cdac30b441e4df0a3f5c0924d1637b9f67b90
diff --git a/Makefile.am b/Makefile.am
index 71f7b91..8ab73a6 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -28,6 +28,7 @@
 
 # Order must be preserved
 SUBDIRS = \
+	doc \
 	CommonLibs \
 	GSM \
 	Transceiver52M \