staging: rdma: hfi1: sdma: Remove wrapper functions

Drop wrapper functions sdma_start_err_halt_wait() and
sdma_start_sw_clean_up() that can be replaced by a direct call to
schedule_work() and tasklet_hi_schedule() respectively both of which
are standard kernel functions.

Signed-off-by: Amitoj Kaur Chawla <amitoj1606@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>