Previously std::once_flag was assigned per map:
std::unordered_map<ContextId, std::unique_ptr<SipKernel>> which was
incorrect and caused the situation in which SipKernel is allocated only
on 1 context and was skipped for other contexts, so we ended up with
only one allocation regardless of the number of contexts.
This change assigns std::once_flag for each allocated SipKernel.
Related-To: NEO-7630
Signed-off-by: Fabian Zwolinski <fabian.zwolinski@intel.com>
91019afa4b