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Introduce `platform-config` in CompileSpec for MediaTek backend (#10464)

### Summary
- Introduce platform-config for setting targeted platform
- mt6989 for D9300
- mt6991 for D9400
N
neuropilot-captain committed
879235b7e86e2c5b10a63c1bbfb73c11d691da4a
Parent: 0a6f622
Committed by GitHub <noreply@github.com> on 5/15/2025, 5:53:09 PM