fix path stuff and kconfig references

firmware/CMakeLists.txt

@@ -0,0 +1,15 @@
+# Copyright (c) 2021 Nordic Semiconductor ASA
+# SPDX-License-Identifier: Apache-2.0
+#
+# This CMake file is picked by the Zephyr build system because it is defined
+# as the module CMake entry point (see zephyr/module.yml).
+
+
+# This is needed so that custom driver classes using system calls are taken into
+# account
+zephyr_syscall_include_directories(include)
+
+zephyr_include_directories(include)
+
+add_subdirectory(drivers)
+add_subdirectory(lib)