msm: camera: Enable exporting vfe registers and tables to userspace.

For the VFE Test Vectors Tool, userspace code needs vfe register
dump as well as image processing tables written through DMI. This
patch enables exporting this capability.

Change-Id: I69fd110867e60d36a0b5a9fa2311413614a54514
Signed-off-by: Ujwal Patel <ujwalp@codeaurora.org>