radeon: recreate PCIE GART VRAM object on resume - #493
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evergreen_pcie_gart_enable() hard-fails if rdev->gart.robj is NULL, which happens across S3 resume. radeon_gart_table_vram_pin() already restores GART entries from a system-RAM shadow independent of the BO, so just re-allocate robj instead of erroring out.
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evergreen_pcie_gart_enable() hard-fails if rdev->gart.robj is NULL, which happens across S3 resume. radeon_gart_table_vram_pin() already restores GART entries from a system-RAM shadow independent of the BO, so just re-allocate robj instead of erroring out.