msm: camera: isp: Disable the rdi sof in none RDI only session

In none RDI only session, IFE only need SOF from the pixel stream.
This change make sure we did not subscribe the RDI sof event in
none RDI only session. The side beneift of this change also fixes
the event payload leak in the none RDI only session.

Change-Id: I318016dfc282a0fc8f58db29a1acbc8422b07ddb
Signed-off-by: Jing Zhou <jzhou70@codeaurora.org>