msm: camera: Add support for enabling DSx, stats and input select

DSx, stats and input select are part of core config registers.
Add support to enable them.

Change-Id: I8e7ea618a57c235d23c4fb65c9fce8087f153cbc
Signed-off-by: Viswanadha Raju Thotakura <viswanad@codeaurora.org>