radv: Disable primitive restart for non-indexed draws

radv: Disable primitive restart for non-indexed draws

According to the Vulkan spec, VkPipelineInputAssemblyStateCreateInfo's
primitiveRestartEnable flag should only apply to indexed draws, however
it was being enabled regardless of the type of draw. This could cause
problems for non-indexed draws with >=65535 vertices if the previous
indexed draw used 16-bit indices.

Fixes corruption of the credits text in Mad Max.

v2: Reset primitive restart state after executing a secondary command
    buffer.

Signed-off-by: Alex Smith <asmith@feralinteractive.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>