cjson: Add Copyright and License for reuse compliance

Signed-off-by: Andrei Gherzan <andrei.gherzan@huawei.com>

meta-ohos-foundation/recipes-libs/cjson/cjson_1.7.14.bb

+# SPDX-FileCopyrightText: Huawei Inc.
+#
+# SPDX-License-Identifier: Apache-2.0
+
 SUMMARY = "Ultralightweight JSON parser library in ANSI C"
 LICENSE = "MIT"
 LIC_FILES_CHKSUM = "file://LICENSE;md5=218947f77e8cb8e2fa02918dc41c50d0 \