Change mapping table of web filesystem.read and filesystem.write

Change mapping table of web filesystem.read and filesystem.write

- Add core privilege filesystem.read and filesystem.write to resolve
native and web privilege level mismatch.
    - Web filesystem.read and filesystem.write are public level
    privilege and native systemsettings.admin is platform level
    privilege. They were mapped because of the 2.X smack rules but
    checked that Web filesystem.read/write privileged device APIs are
    not wrappers of native systemsetting.admin privileged APIs. Hence
    add core privilege for filesystem.read and write separately and
    remove mapping to the systemsettings.admin.

Change-Id: I3fcef8aea58a0292e8b8accb4692b14ba3eb36af
Signed-off-by: Yunjin Lee <yunjin-.lee@samsung.com>