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Must limit vold calls to fs_mkdirs() only when the volume is mounted.
If NOT, it will trigger selinux warning as follows.
audit(1398835637.785:8): avc:  denied  { write } for  pid=137 comm="vold" name="sdcard0" dev="rootfs" ino=3191 scontext=u:r:vold:s0 tcontext=u:object_r:rootfs:s0 tclass=dir

Change-Id: I1113fc961cbdd8bbd2fcbf740c2f504628c8399d
Signed-off-by: Cylen Yao <cylen.yao@mediatek.com>