fs: Remove the duplication umount macro
which is already defined in include/sys/mount.h
#define CH_STAT_ATIME (1 << 3)
#define CH_STAT_MTIME (1 << 4)
-/* nx_umount() is equivalent to nx_umount2() with flags = 0 */
-
-#define umount(t) umount2(t,0)
-
/****************************************************************************
* Public Type Definitions
****************************************************************************/
