Global signal cleanup, take 2

This is v2 of the global signal cleanup series. This patch series moves all remaining archs to the get_signal() and signal_setup_done() functions. Currently these archs use open coded variants of the said functions. Further, unused parameters get removed from get_signal_to_deliver(),

Global signal cleanup, take 2

This is v2 of the global signal cleanup series. This patch series moves all remaining archs to the get_signal() and signal_setup_done() functions. Currently these archs use open coded variants of the said functions. Further, unused parameters get removed from get_signal_to_deliver(),