add trx.opts to build osmo-bts-trx and osmo-trx with UHD
diff --git a/trx.opts b/trx.opts
new file mode 100644
index 0000000..0ad61cb
--- /dev/null
+++ b/trx.opts
@@ -0,0 +1,2 @@
+osmo-trx --with-uhd
+osmo-bts --enable-trx