service-locator: Start the locator service by default

There's no reason why the locator service should start in
a 'disabled' manner. Hence, unless otherwise stated by the
cmdline arguments, start the service by default.

Change-Id: I8377aabed691c402c47352aadfdd4ded25f1f459
Signed-off-by: Raghavendra Rao Ananta <rananta@codeaurora.org>