circbuf: Move from mm/circbuf to libs/libc/misc

so that it can be used by userspace program.

Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
Signed-off-by: Neo Xu <neo.xu1990@gmail.com>

mm/Makefile

@@ -30,7 +30,6 @@ include kmm_heap/Make.defs
 include mm_gran/Make.defs
 include shm/Make.defs
 include iob/Make.defs
-include circbuf/Make.defs
 include mempool/Make.defs
 include kasan/Make.defs
 include ubsan/Make.defs

mm/circbuf/CMakeLists.txt

@@ -1,22 +0,0 @@
-# ##############################################################################
-# mm/circbuf/CMakeLists.txt
-#
-# SPDX-License-Identifier: Apache-2.0
-#
-# Licensed to the Apache Software Foundation (ASF) under one or more contributor
-# license agreements.  See the NOTICE file distributed with this work for
-# additional information regarding copyright ownership.  The ASF licenses this
-# file to you under the Apache License, Version 2.0 (the "License"); you may not
-# use this file except in compliance with the License.  You may obtain a copy of
-# the License at
-#
-# http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
-# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
-# License for the specific language governing permissions and limitations under
-# the License.
-#
-# ##############################################################################
-target_sources(mm PRIVATE circbuf.c)

mm/circbuf/Make.defs

@@ -1,30 +0,0 @@
-############################################################################
-# mm/circbuf/Make.defs
-#
-# SPDX-License-Identifier: Apache-2.0
-#
-# Licensed to the Apache Software Foundation (ASF) under one or more
-# contributor license agreements.  See the NOTICE file distributed with
-# this work for additional information regarding copyright ownership.  The
-# ASF licenses this file to you under the Apache License, Version 2.0 (the
-# "License"); you may not use this file except in compliance with the
-# License.  You may obtain a copy of the License at
-#
-#   http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
-# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
-# License for the specific language governing permissions and limitations
-# under the License.
-#
-############################################################################
-
-# Circular buffer management
-
-CSRCS += circbuf.c
-
-# Add the circular buffer directory to the build
-
-DEPPATH += --dep-path circbuf
-VPATH += :circbuf