msm: camera: Add support for mapping secure memory for CDSP access

Add ion CDSP flag while allocating memory from secure heap for content
protection when CDSP needs to access the buffers.

Change-Id: I7df7b5086af66807e08ada602bd9eac76e965376
Signed-off-by: Viswanadha Raju Thotakura <viswanad@codeaurora.org>
Signed-off-by: Raja Mallik <rmallik@codeaurora.org>