core_ctl: Bail out early from the boost API when core_ctl is disabled

core_ctl can be completely disabled from a kernel parameter now.
Add a check to bail out early from the boost API.

Change-Id: I4d94a59bce755bfcf7c91a4db1b4693ff5b3f6bb
Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>
Signed-off-by: Satya Durga Srinivasu Prabhala <satyap@codeaurora.org>