init.rc: surfaceflinger: use min realtime sched priority

Use the rlimit service option to allow surfaceflinger to use the
minimum realtime scheduler priority. Surfaceflinger uses this priority
to minimize latency of vsync events.

Change-Id: Id3eec568a64d8957f1748eeee11abf92f29ab083
Reviewed-on: http://gerrit.pcs.mot.com/550181
SLT-Approved: Slta Waiver <sltawvr@motorola.com>
Tested-by: Jira Key <jirakey@motorola.com>
Reviewed-by: Christopher Fries <c.fries@motorola.com>
Reviewed-by: Patrick Auchter <auchter@motorola.com>
Reviewed-by: Klocwork kwcheck <klocwork-kwcheck@sourceforge.mot.com>
Reviewed-by: Jeffrey Carlyle <jeff.carlyle@motorola.com>
Reviewed-by: Stephen Rossbach <ccpm12@motorola.com>
Submit-Approved: Jira Key <jirakey@motorola.com>
(cherry picked from commit 7d8919c0ceac940ce71ab49ba3d672b147ba5058)