[SPARC64]: Use trap type stored in pt_regs to handle syscall restart.

Now that we can check the trap type directly, we don't need the
funny restart_syscall indication from the trap return paths.

Signed-off-by: David S. Miller <davem@davemloft.net>

diff --cc arch/sparc64/kernel/signal.c
Simple merge

diff --cc arch/sparc64/kernel/signal32.c
Simple merge