Mount emulated storage in root mode.

Make sure to tell su to mount the emulated storage. As this means that
the su shell lives in its own mount namespace, perform remount
operations on both the foreground and the background console.

Change-Id: I9372eefa1df91d1ecd3c89a25a391b977d77da45
CMFM: Notify to media scanner when some file changed

Patchset 2: Remove unnecessary calls to media scan

Change-Id: Ie56ccdd992e2a93c63ab7587135de7cb63bff92e
Signed-off-by: Jorge Ruesga <jorge@ruesga.com>
Merge "CMFM: Notify to media scanner when some file changed" into cm-10.2
Merge remote-tracking branch 'cm/cm-10.2' into wszf