[LINUX] Manage Tiler Pinning for dce DRM buffers

Applications using dce_alloc/dce_free calls to manage memory,
leaked memory because on non-closure of the created dmabuf fds.
Additionally, all memory allocated from Tiler/DMM via DRM need to be
explictly pinned to tiler using dce_buf_lock/dce_buf_unlock calls.
Hence in the earlier implementation, every call to dce_alloc/free
had to be followed by a lock/unlock call to pin/unpin it to tiler.
In order, to insulate the applications from the internal details of
DRM memory management and for ease of use of alloc and free calls,
dce_alloc now takes care of creating the dmabuf and pinning it to tiler
while dce_free takes care of tiler unpinning and closure of dmabuf fd.
Applications can continue to use dce_alloc and dce_free calls as before
thus maintiaining backward compatibility.

On the other hand, since the same interfaces are used for multiple remote
core targets, like IPU and DSP, MemHeader struture is upgraded to hold the
core for which the block of memory belongs to, to keep track of the core.

Hence all applications/Remote cores using this version of libdce should
recompile with the new MemHeader for proper functioning.

Dependent IPUMM patch: https://gerrit.ext.ti.com/gerrit/omap/#/c/12994/

Change-Id: If09a1039b5b16f3cc5ff0e9c6c598932d8a2ce3e
Signed-off-by: Pradeep Venkatasubbarao <pradeepv@ti.com>
Signed-off-by: Amarinder Bindra <a-bindra@ti.com>
Signed-off-by: Karthik Ramanan <a0393906@ti.com>

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