msm: smem: Rename smem_get_entry_to_proc() to smem_get_entry()

smem_get_entry_to_proc() is the preferred function for locating SMEM items
without knowing the size, but its name is quite verbose with little added
benefit to clients.  Rename smem_get_entry_to_proc() to smem_get_entry() as
smem_get_entry() succinctly describes the purpose of the function.

Change-Id: I920442933bcfffb8f6bf3808ea240718bf0d105e
Signed-off-by: Jeffrey Hugo <jhugo@codeaurora.org>