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radv: fix VRR not working with prime

Yogesh Mohan Marmithu requested to merge yogeshmohan/mesa:radv_prime_vrr_fail into main

With display on iGPU and render on dGPU, VRR is not working. To fix this set flag RADEON_FLAG_GTT_WC while allocating memory for prime. This allows kernel to allocate GTT memory that can be scan out in iGPU and in turn which helps xserver to do flip instead of blit. With this VRR feature is working with prime.

Edited by Yogesh Mohan Marmithu

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