Zygote: enable CAP_BLOCK_SUSPEND capability for system server

Starting from kernel 3.6, it requires processes to have the capability
CAP_BLOCK_SUSPEND to set/unset wake locks. Adds CAP_BLOCK_SUSPEND
to the list of capabilities for system server, so that PowerManager
can set wake locks.

Change-Id: I3246e6f6e6cb8f0bedb1c0417ed07085ee1f3aaa
Signed-off-by: Daniel Leung <daniel.leung@intel.com>
Merge "Zygote: enable CAP_BLOCK_SUSPEND capability for system server"
Merge remote-tracking branch 'aosp/master' into fml-master