s3: rpc_server: Remove SAMR specific policy_handle_create() function

s3: rpc_server: Remove SAMR specific policy_handle_create() function

Now that we pass the handle type to the generic handle creation and find
functions we can drop the specific SAMR ones.

The policy_handle_create() function labeled the talloc chunk used to
allocate the handle's associated data, and the policy_handle_find() is
checking the name matches with the expected data. The check is performed
now by the generic functions based on the handle type so we can drop
these SAMR specific functions.

Signed-off-by: Samuel Cabrero <scabrero@samba.org>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>