Do not restrict image buffer allocation to multiple of PAGE_SIZE

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This patchset removes the constraint which enforced image buffer
size to be multiple of PAGE_SIZE. It improves efficiency by allowing
storing images directly to Ximage buffers removing the need to copy
image data.

It is tested with mmap and userptr methods, changes to V4L1
compatibility layer are not tested.

The first patch applies directly to the V4L2 framework, rest of the
patches make the necessary modifications also to omap34xxcam and
OMAP3 ISP drivers and require those first to be included.


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