Fix GRBM_STATUS bit positions for RDNA (GFX10+) GPUs#181
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On RDNA, the GRBM_STATUS register layout changed: - Bit 10 (Event Engine): reserved/undefined - Bits 16-17 (VGT): replaced by Geometry Engine at bit 21 - Bit 21 (Sequencer Instruction Cache): now Geometry Engine Repurpose the VGT field to read GE_BUSY (bit 21) and label it "Geometry Engine" in the UI and dump output. Hide Event Engine and Sequencer Instruction Cache on RDNA since those blocks no longer exist. Other bits (TA, SX, SPI, SC, PA, DB, CB, GUI) are unchanged across all generations.
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Summary
Independent of #178 — can be merged separately.
On RDNA (GFX10+), the GRBM_STATUS register layout changed from GCN:
The VGT field now reads GE_BUSY (Geometry Engine, bit 21) which is the functional successor to VGT on RDNA.
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