drm/amdgpu: disable ras query and iject during gpu reset

added flag to ras context to indicate if ras query functionality is ready

Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: John Clements <john.clements@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>