Disable DVRP workaround for compatible adapters

[uyjulian]

Supersedes and fixes #914

[LAP87]

Tested on real hardware: PAL SCPH-50004 with a clone adapter (Spartan-3 XC3S50AN + JM20330, board rev 080825V9) and a 4 TB GPT/exFAT drive.

Test build: current master (a13b5971) plus only this PR's diff, fully stock bdm/bdmfs_fatfs/ata_bd modules — none of the out-of-tree patches. Baseline for comparison: stock master fails mass0: mount on this adapter with -EIO, because the falsely asserted SPD_CAPS_DVR bit truncates capacity to 28-bit and GPT parsing rejects the disk.

Result with this PR:

PASS IOP + stock modules
PASS mount mass0:/
PASS root: entries=12 CD=1 DVD=1

The runtime detection fires correctly on this adapter (SPD_REG16(0x20) != 1), ata_dvrp_workaround is cleared, the full capacity is reported and the GPT/exFAT volume mounts and enumerates. This supersedes #914 nicely — closing that one.

Scope note for anyone reading along: data transfers beyond 128 GiB on these clones still hit two separate hardware faults (DMA address wrap and a multi-sector PIO burst limit) that this PR does not claim to address; characterization at https://github.com/LAP87/ps2-gamestar-pio.

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