busybox: Make sure GPT support is enabled

We work with GPT-based targets for some of our reference boards. Make
sure busybox has GPT support.

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

meta-ohos-core/recipes-core/busybox/busybox/allscenarios.cfg

+CONFIG_FEATURE_GPT_LABEL=y

meta-ohos-core/recipes-core/busybox/busybox_%.bbappend

+# SPDX-FileCopyrightText: Huawei Inc.
+#
+# SPDX-License-Identifier: Apache-2.0
+
+FILESEXTRAPATHS_prepend := "${THISDIR}/${PN}:"
+SRC_URI += "file://allscenarios.cfg"