v4l2-compat-ioctl32: Add support for private buffers

Add support for copying length and userptr fields from user
space private buffers to kernel space and vice versa.

CRs-Fixed: 2569267
Change-Id: Iea10763a8ef990486acd0ed0e05a4735aa928ba4
Signed-off-by: himta ram <hram@codeaurora.org>
2 files changed