gn: Drop local version in favour of the meta-arm one

meta-arm provides a gn recipe already and that is a dependency of our
environment so we can use it without maintaining our own recipe.

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

meta-oniro-staging/recipes-devtools/gn/gn-native_git.bb

-# SPDX-FileCopyrightText: Huawei Inc.
-#
-# SPDX-License-Identifier: Apache-2.0
-
-SUMMARY = "Meta-build system that generates build files for Ninja"
-LICENSE = "BSD-3-Clause & Unicode"
-LIC_FILES_CHKSUM = "file://LICENSE;md5=0fca02217a5d49a14dfe2d11837bb34d \
-                    file://src/base/third_party/icu/LICENSE;md5=97cdee8fe9e91b393a616bc13c8081db"
-
-SRC_URI = "git://gn.googlesource.com/gn.git;protocol=https"
-
-DEPENDS = "ninja-native"
-
-PV = "0.0+git${SRCPV}"
-SRCREV = "39a87c0b36310bdf06b692c098f199a0d97fc810"
-
-S = "${WORKDIR}/git"
-
-inherit native
-
-do_configure () {
-	python3 build/gen.py --no-strip --out-path ${B}
-}
-
-do_compile () {
-	ninja -C ${B}
-}
-
-do_install () {
-	install -D ${B}/gn ${D}${bindir}/gn
-}