lsu: reset state for write pending

Define the store_buffer_write_pending signal to be low after reset.
lsu: add missing signal definition

dc_refill_req was not properly defined if the cache is deactivated.
cappuccino/ctrl: do not copy FO from esr on rfe

The FO (fixed one) bit should always be set to one,
allowing it to be altered through esr is not allowed.
Merge branch 'master' of github.com:openrisc/mor1kx into multicore
dcache: define snoop_hit in corner cases

When snooping is not enabled, define the snoop hit to be low. When the
cache is not enabled it should also be static low.
cappuccino/lsu: break atomic link when snoop occurs at the same time as load

This fixes a corner case where the snoop occurs at the exact
time as the load.