vkr: fix VK_KHR_synchronization2 dispatches
This fixes !949 (merged). I had the wrong impression that the vkr side entries were added in the prior 1.3 effort...
Test: dEQP-VK.synchronization2.*
passes 100% with mesa/mesa!19046 (merged)
Test run totals:
Passed: 9760/49781 (19.6%)
Failed: 0/49781 (0.0%)
Not supported: 40021/49781 (80.4%)
Warnings: 0/49781 (0.0%)
Waived: 0/49781 (0.0%)
Follow up: update venus-protocol to log and set CS fatal when dispatching to NULL
/cc @chadversary @ryanneph
Edited by Yiwei Zhang