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backends/drm: Fix buffer centering with active hardware transform

Vlad Zahorodnii requested to merge work/zzag/backend-drm-fix-buffer-centering-with-hardware-transform into master

Prior to beb6cca6, the drm backend used to specify QRect(0, 0, modeSize.width(), modeSize.height()) CRTC rect, so we didn't have to care about buffer transforms, but now that we compute the CRTC rect from the buffer size, we have to take the buffer transform into account.

It fixes squashed output contents when the output is rotated 90 or 270 degrees and it uses hardware transforms.

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