Remove -kernel -recovery from keystore_data_file neverallow.

Aside from the keystore daemon itself, only init needs any access
to keystore_data_file (in order to create and potentially restorecon
/data/misc/keystore).  The exceptions for the kernel and recovery domains
are unnecessary; no allow rule permits this access in current policy.

Change-Id: I5cf6f29ec08174017ac8f5fb36fef166ce360ca0
Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>