cpu: Fix LLSC atomic CPU wakeup
Writes to locked memory addresses (LLSC) did not wake up the locking

CPU. This can lead to deadlocks on multi-core runs. In AtomicSimpleCPU,

recvAtomicSnoop was checking if the incoming packet was an invalidation

(isInvalidate) and only then handled a locked snoop. But, writes are

seen instead of invalidates when running without caches (fast-forward

configurations). As as simple fix, now handleLockedSnoop is also called

even if the incoming snoop packet are from writes.
Tests, Ran regression on all ISAs, observed acceptable change in 1:

opt/quick/fs/10.linux-boot/arm/linux/realview-simple-timing-dual