add Xilinx_abort_fn to Xilinx_Spartan3_Slave_Serial_fns

Currently the hardware was left in an undefined state in case Spartan3
serial load failed. This patch adds Xilinx_abort_fn to give the board
a possibility to clean up in this case.

Signed-off-by: Wolfgang Wegner <w.wegner@astro-kom.de>
2 files changed