ohos-googletest: Add Copyright and License for reuse compliance

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

meta-ohos-acts/recipes-ohos-googletest/ohos-googletest/ohos-googletest_git.bb

+# SPDX-FileCopyrightText: Huawei Inc.
+#
+# SPDX-License-Identifier: Apache-2.0
+
 LICENSE = "BSD-3-Clause"
 LIC_FILES_CHKSUM = "file://LICENSE;md5=cbbd27594afd089daa160d3a16dd515a \
                     file://googlemock/LICENSE;md5=cbbd27594afd089daa160d3a16dd515a \