On multi device contexts we allocate svm in system memory.
This caused svmMap calls to assume no copy is needed and
no cache flush was sent to gpu and data modified by earlier
gpu commands was not being visible on host.
This change will add pipecontrol with dcFlush on svmMap
calls when task count from wait is enabled.
Related-To: NEO-6948
Signed-off-by: Dominik Dabek <dominik.dabek@intel.com>
ae61f0368a