scripts/dts: provide edts sanity check scripts

Validate generated etds.json against a reference edts file.
Script first checks edts structure then content of various elements
and finally devices parameters values.
This last step is done using a specific method for ref_edts
parameter extraction so we can verify behavior of
edtsdatabase class extraction function.

Signed-off-by: Erwan Gouriou <[email protected]>

Author: erwango

scripts/dts_sanity/dummy_app/CMakeLists.txt

@@ -0,0 +1,6 @@
+cmake_minimum_required(VERSION 3.8.2)
+
+include($ENV{ZEPHYR_BASE}/cmake/app/boilerplate.cmake NO_POLICY_SCOPE)
+project(NONE)
+
+target_sources(app PRIVATE ${ZEPHYR_BASE}/misc/empty_file.c)

scripts/dts_sanity/dummy_app/prj.conf

@@ -0,0 +1 @@
+# nothing here