drm-shim: Stub syncobj reset ioctl
What does this MR do and why?
Stub syncobj reset ioctl in drm-shim.
Fixes DRM_SHIM: unhandled core DRM ioctl 0xC4 (0xc01064c4).
Found while looking at VK_KHR_shader_subgroup_uniform_control_flow on Turnip.
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