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drm/nouveau/fb/ramnv50: Fix DDR2 reclocking on NV50 architectures

Jonathan Fouquart requested to merge jfouquart/nouveau:NV50_DDR2_reclocking into nouveau-next

On my venerable Geforce 9600M GT (on-board card), I got the message 'fb: Could not calculate MR' when reclocking the card. This was due to a missing call to the 'nvkm_sddr2_calc' function when calculating the memory clock frequency.

With this change, I no longer have any errors when reclocking, the memory frequency is correctly calculated, and I have a performance gain of around 30% on glxgears, and my card remains stable when running under wine or retroarch.

Before patch: Capture_d_écran_du_2023-08-28_21-22-16

After patch: Capture_d_écran_du_2023-08-29_00-08-35

Edited by Jonathan Fouquart

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