winsys/radeon: Use CPU page size instead of hardcoding 4096 bytes v3
Fixes GPUVM conflicts with non-4K page size. Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=92738 v2: Replace sanitization of VM base address alignment with comment why that's not necessary. v3: Use unsigned instead of long as the type for the size_align member. (Marek) Cc: mesa-stable@lists.freedesktop.org Reviewed-by: Christian König <christian.koenig@amd.com> (v1) Reviewed-by:Marek Olšák <marek.olsak@amd.com> (cherry picked from commit 24abbaff)