modules: Add zcbor Kconfig and cmake recipe

The commit adds files for the zcbor to be built as module.

Signed-off-by: Dominik Ermel <dominik.ermel@nordicsemi.no>

modules/Kconfig

@@ -32,6 +32,7 @@ source "modules/Kconfig.tinycbor"
 source "modules/Kconfig.tinycrypt"
 source "modules/Kconfig.vega"
 source "modules/Kconfig.xtensa"
+source "modules/zcbor/Kconfig"
 source "modules/Kconfig.mcuboot_bootutil"
 
 comment "Unavailable modules, please install those via the project manifest."
@@ -80,6 +81,9 @@ comment "CANopenNode module not available."
 comment "FFF module not available."
 	depends on !ZEPHYR_FFF_MODULE
 
+comment "zcbor module not available."
+	depends on !ZEPHYR_ZCBOR_MODULE
+
 # This ensures that symbols are available in Kconfig for dependency checking
 # and referencing, while keeping the settings themselves unavailable when the
 # modules are not present in the workspace

modules/zcbor/CMakeLists.txt

@@ -0,0 +1,12 @@
+if(CONFIG_ZCBOR)
+  zephyr_include_directories(
+    ${ZEPHYR_ZCBOR_MODULE_DIR}/include
+  )
+
+  zephyr_library()
+  zephyr_library_sources(
+    ${ZEPHYR_ZCBOR_MODULE_DIR}/src/zcbor_common.c
+    ${ZEPHYR_ZCBOR_MODULE_DIR}/src/zcbor_decode.c
+    ${ZEPHYR_ZCBOR_MODULE_DIR}/src/zcbor_encode.c
+  )
+endif()

modules/zcbor/Kconfig

@@ -0,0 +1,10 @@
+# Copyright (c) 2022 Nordic Semiconductor ASA
+# SPDX-License-Identifier: Apache-2.0
+
+config ZEPHYR_ZCBOR_MODULE
+	bool
+
+config ZCBOR
+	bool "zcbor library"
+	help
+	  Enable zcbor CBOR encoder/decoder library