refactor: 不同C库的malloc适配归一

1. 不同C库的malloc实现归一化，由原先//kal/libc/musl、//kal/libc/newlib、
   //../../third_party/musl/porting/liteos_m_iccarm/kernel 各自实现，
   统一至//kal/posix/src/malloc.c实现，并实现对三种C库的兼容

2. Kconfig归一化的配套调整，删除Top->"Compat"->"Choose libc implementation"下
   malloc API的开关控制，统一归入"Top"->"Compat"->"Enable POSIX API"下
   "Enable POSIX MALLOC API"进行能力开关控制

BREAKING CHANGE:
Kconfig变更：
删除：
LOSCFG_LIBC_ICCARM_MALLOC
LOSCFG_LIBC_NEWLIB_MALLOC
新增：
LOSCFG_POSIX_MALLOC_API

close: I6AGOW

Signed-off-by: arvinzzz <zhaotianyu9@huawei.com>
Change-Id: I584e337cdb36184cf40c36c4f7c73ab780c31a42

components/fs/vfs/vfs_fs.c

@@ -555,7 +555,9 @@ int open(const char *path, int flags, ...)
     int ret = VfsOpen(path, flags);
     return MapToPosixRet(ret);
 }
+#if (LOSCFG_LIBC_NEWLIB == 1)
 FUNC_ALIAS(open, _open, (const char *path, int flags, ...), int);
+#endif
 
 int close(int fd)
 {
@@ -581,7 +583,9 @@ int close(int fd)
     }
     return MapToPosixRet(ret);
 }
+#if (LOSCFG_LIBC_NEWLIB == 1)
 FUNC_ALIAS(close, _close, (int fd), int);
+#endif
 
 ssize_t read(int fd, void *buff, size_t bytes)
 {
@@ -624,7 +628,9 @@ ssize_t read(int fd, void *buff, size_t bytes)
 
     return MapToPosixRet(ret);
 }
+#if (LOSCFG_LIBC_NEWLIB == 1)
 FUNC_ALIAS(read, _read, (int fd, void *buff, size_t bytes), ssize_t);
+#endif
 
 ssize_t write(int fd, const void *buff, size_t bytes)
 {
@@ -654,7 +660,9 @@ ssize_t write(int fd, const void *buff, size_t bytes)
 
     return MapToPosixRet(ret);
 }
+#if (LOSCFG_LIBC_NEWLIB == 1)
 FUNC_ALIAS(write, _write, (int fd, const void *buff, size_t bytes), ssize_t);
+#endif
 
 off_t lseek(int fd, off_t off, int whence)
 {
@@ -675,7 +683,9 @@ off_t lseek(int fd, off_t off, int whence)
     VfsDetachFile(file);
     return ret;
 }
+#if (LOSCFG_LIBC_NEWLIB == 1)
 FUNC_ALIAS(lseek, _lseek, (int fd, off_t off, int whence), off_t);
+#endif
 
 int stat(const char *path, struct stat *stat)
 {
@@ -713,7 +723,9 @@ int stat(const char *path, struct stat *stat)
     LOS_FsUnlock();
     return MapToPosixRet(ret);
 }
+#if (LOSCFG_LIBC_NEWLIB == 1)
 FUNC_ALIAS(stat, _stat, (const char *path, struct stat *stat), int);
+#endif
 
 int statfs(const char *path, struct statfs *buf)
 {
@@ -780,7 +792,9 @@ int unlink(const char *path)
     LOS_FsUnlock();
     return MapToPosixRet(ret);
 }
+#if (LOSCFG_LIBC_NEWLIB == 1)
 FUNC_ALIAS(unlink, _unlink, (const char *path), int);
+#endif
 
 int rename(const char *oldpath, const char *newpath)
 {
@@ -1074,7 +1088,9 @@ int fstat(int fd, struct stat *buf)
     VfsDetachFile(filep);
     return ret;
 }
+#if (LOSCFG_LIBC_NEWLIB == 1)
 FUNC_ALIAS(fstat, _fstat, (int fd, struct stat *buf), int);
+#endif
 
 int fcntl(int fd, int cmd, ...)
 {