camera: native: make video buffers 4K aligned.

This change makes sure that the video buffers are
4K aligned in size, as required by the video encoder.
This requriement was implicitly applied by the PMEM
driver but needs to be made manually for ION.

This is port of:
https://www.codeaurora.org/cgit/quic/la/platform/hardware/qcom/camera/commit/?id=f7f1b8c9c963d03c95a5c9d631cbc3e9fda59437