Cortex A15: temporarily remove -mcpu switch again

Make compiler stop complaining about every compilation unit.

Fixes #810.
base: activate Rpc_entrypoint explicitly in dtor

The Rpc_exit call is delivered via RPC which results in a deadlock
if the Rpc_entrypoint has not been started yet. To prevent this
situation we active the Rpc_entrypoint explicitly before we call
Rpc_exit.

Fixes #811.
pistachio: return kip structure from get_kip

to avoid lot of unnecessary casts afterwards

Issue #798
pistachio: exclude io memory from ram allocator

Fixes #798
run: dump output of noux_net_netcat

Issue #742