fix(debugger): use per-context fences for vm_bind operations

- vm_bind with user fence updates fence value independently for every
VM hence with per-context VMs, every context needs its unique fence
address. This prevents 2 contexts from updating value possibly
writing lower value than the one that was already stored

Resolves: NEO-8004

Signed-off-by: Mateusz Hoppe <mateusz.hoppe@intel.com>

shared/test/common/mocks/linux/mock_os_context_linux.h

@@ -12,6 +12,8 @@ namespace NEO {
 class MockOsContextLinux : public OsContextLinux {
   public:
     using OsContextLinux::drmContextIds;
+    using OsContextLinux::fenceVal;
+    using OsContextLinux::pagingFence;
 
     MockOsContextLinux(Drm &drm, uint32_t rootDeviceIndex, uint32_t contextId, const EngineDescriptor &engineDescriptor)
         : OsContextLinux(drm, rootDeviceIndex, contextId, engineDescriptor) {}