msm: smem: Rename smem_find_to_proc() to smem_find()

smem_find_to_proc() is the preferred function for locating SMEM items,
but its name is quite verbose with little added benefit to clients.  Rename
smem_find_to_proc() to smem_find() as smem_find() succinctly describes
the purpose of the function.

Change-Id: I8d7a78a6f6226d9e15e9f69e8194fcdaf5c7d8fe
Signed-off-by: Jeffrey Hugo <jhugo@codeaurora.org>