nx2: log per-call and periodic diagnostic lines at debug level

A 9-minute Mario Kart World session wrote 36k log lines at the default
level, most of them one per GPU call: nx2:syncpt 201/202 (12k), gpu
submit jobs (7k), memory registrations (7k), "Lowered native shader"
(1.6k), and 4.7k "Storage buffer tracked without bias" warnings, which
every Switch 2 shader hits. These, the texture cache's per-image and
per-format detail lines, the 3D image shapes and the per-type VMA lines
are now debug level. The once-a-report summary lines (texture cache
memory, images created/deleted, VMA heap budget) stay at info.

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