sparc: Remove unused leon_trans_init

The function leon_trans_init is unused. Remove it and save us from
figuring out what to do with a '<NULL>' node name.

Cc: "David S. Miller" <davem@davemloft.net>
Cc: sparclinux@vger.kernel.org
Signed-off-by: Rob Herring <robh@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>