vulkan: hack: use 65536 as min alignment for virtualized sub-mappings

Fixes: 152769369

Longer-term solution is to use individual mmaps per host visible alloc
and to mmap MAP_FIXED replace them if alignment is insufficient.

Change-Id: Ie0219b9873aea5b45bb1e0bb5117d2c4480f2a88
1 file changed