HACK: misc: Add dma-buf to physical address exporter

This is driver allows user-space to attach a DMA-BUF and
receive back its CPU physical address. This is a temporary
solution to allow CMEM like functionality from allocated
buffers. This is a hack and this will be removed when proper
solutions are implemented.

Signed-off-by: Andrew F. Davis <afd@ti.com>
Signed-off-by: Gowtham Tammana <g-tammana@ti.com>