Revert "crypto: api - Add crypto_tfm_get"

This reverts commit e470d423 which is
commit ae131f49 upstream.

It breaks the Android kernel abi and can be brought back in the future
in an abi-safe way if it is really needed.

Bug: 161946584
Change-Id: I5292b6943ca50ef57b754862ddd33f7a782310c9
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>