nvdrv: Add GetTpcMasks2 support and improve memory mapping validation

This commit makes two main changes:

1. Adds support for GetTpcMasks2 (ioctl 0x13) in nvhost_ctrl_gpu:
- Implements new GetTpcMasks2 method to handle TPC mask queries
- Adds IoctlGetTpcMasks structure to store mask parameters
- Returns conservative single TPC configuration for compatibility

2. Enhances memory mapping validation in HostMemory:
- Adds verification check after memory mapping operations
- Improves error handling for direct mapped address enabling
- Adds logging for mapping and direct address failures

Additional changes:
- Updates copyright headers to include citron Emulator Project
- Improves error handling and validation in several paths
- Adds debug logging for TPC mask operations

This improves GPU virtualization support and memory mapping reliability.

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