nx2: shrink the graphics server pool to 2 GiB

The 12 GB layout added 8 GiB of DRAM for memory the Switch 2 graphics
server keeps, and the whole emulated DRAM is committed at boot, so Switch
2 games needed 20 GB of free commit ("Failed to allocate 20480 MiB of
backing memory" on PCs with 16 GB). With GPU-only regions backed as they
are written and sparse regions taking tiles from the game's memory, Mario
Kart World keeps ~1.1 GiB of the pool (texture pools it fills at boot,
flat afterwards) and Splatoon Raiders none. 2 GiB leaves room and brings
the commit to 14 GB. A title that runs the pool dry loses GPU writes
into its unbacked blocks and logs it once.

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