lora's drivers taken out of examples repo to make a smaller binary

Dependencies:   libxDot-mbed5

Revision:
0:973a5bbb2a17
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed-os.lib	Thu Nov 21 08:46:20 2019 +0000
@@ -0,0 +1,1 @@
+https://github.com/ARMmbed/mbed-os/#c966348d3f9ca80843be7cdc9b748f06ea73ced0