dumpstate: Add SELinux restorecon call.

Set the security context on the directory used
to dump Dalvik and native stack traces.

Change-Id: Iba13783f10e850485ce1a8d4aa5792d55085eb22
Signed-off-by: Robert Craig <rpcraig@tycho.ncsc.mil>
Merge "dumpstate: Add SELinux restorecon call."