Revert "init: do_mounts: Add a dummy definition for dm_table_put"

We no longer require dm_table_put. Upstream fixed the dm_mounts
driver to remove this symbol.

Change-Id: I4ba1043965d25ec444a833283392ac2394c845f3
Signed-off-by: Vikram Mulukutla <markivx@codeaurora.org>