library: lr1110: Add library for LR1110 support

examples/tests/lr1110/README.md

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+LR1110 Test Apps
+================
+
+The [LR1110](https://www.semtech.com/products/wireless-rf/lora-edge/lr1110) is
+an integrated LoRa radio with a WiFi access point scanner and a GNSS scanner
+built in.
+
+These example apps use the `libtock-c/lr1110` library to implement the
+LoRa/WiFi/GNSS functionality. While this library should work with any LR1110
+radio, this was developed and tested with the [WM1110 Dev
+Kit](https://www.seeedstudio.com/Wio-WM1110-Dev-Kit-p-5677.html).

examples/tests/lr1110/lorawan/Makefile

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+# Makefile for user application
+
+# Specify this directory relative to the current application.
+TOCK_USERLAND_BASE_DIR = ../../../..
+
+# External libraries used
+EXTERN_LIBS += $(TOCK_USERLAND_BASE_DIR)/lr1110
+
+override CFLAGS += -I$(TOCK_USERLAND_BASE_DIR)/lr1110
+
+# Which files to compile.
+C_SRCS += $(wildcard *.c)
+
+APP_HEAP_SIZE := 40000
+STACK_SIZE := 4096
+
+# Include userland master makefile. Contains rules and flags for actually
+# building the application.
+include $(TOCK_USERLAND_BASE_DIR)/AppMakefile.mk