use libcoap recipe from upstream

This drops the existing coap recipe and replaces it with libcoap taken from current meta-openembedded master. I didn't have any luck building the old recipe on kirkstone but the one from upstream works fine.

meta-oniro-staging/recipes-connectivity/coap/coap_git.bb

-# SPDX-FileCopyrightText: Huawei Inc.
-#
-# SPDX-License-Identifier: Apache-2.0
-
-SUMMARY = "A C implementation of IETF Constrained Application Protocol (RFC 7252)"
-DESCRIPTION = "libcoap is a C implementation of a lightweight               \
-application-protocol for devices that are constrained their resources such  \
-as computing power, RF range, memory, bandwidth, or network packet sizes.   \
-This protocol, CoAP, is standardized by the IETF as RFC 7252. For further   \
-information related to CoAP, see http://coap.technology."
-
-HOMEPAGE = "http://libcoap.net/"
-SECTION = "libs/network"
-
-# WARNING: Code until 2017-06-01 is dual-licensed as GPLv2 and BSD 2-Clause, it is BSD after that
-LICENSE = "GPLv2 | BSD"
-LIC_FILES_CHKSUM = "file://COPYING;md5=faed8f005d476edd3f250599a4bb9a75 \
-                    file://LICENSE;md5=e44b3af4925ec58e9f49b9ff143b5493 \
-                    file://ext/tinydtls/LICENSE;md5=ffb073dbb36e7ec5e091047332f302c5"
-
-LIBCOAP_VERSION = "4.3.0"
-SRC_URI = "gitsm://github.com/obgm/libcoap.git;protocol=https;branch=release-${LIBCOAP_VERSION}"
-PV = "${LIBCOAP_VERSION}+git${SRCPV}"
-SRCREV = "1da37b9abbe871675d5939395b498324ccc8ecfe"
-
-S = "${WORKDIR}/git"
-
-# FIXME: make it depend on something akin to virtual/tls so we can support openssl, gnutls as well
-DEPENDS = "mbedtls"
-
-inherit pkgconfig autotools
-
-# Specify any options you want to pass to the configure script using EXTRA_OECONF:
-EXTRA_OECONF = "--disable-doxygen --disable-manpages --with-mbedtls"
-
-BBCLASSEXTEND = "native nativesdk"
-
-PACKAGE_BEFORE_PN = "${PN}-examples"
-FILES:${PN}-examples = "${datadir}/libcoap/examples/*"