SCDC channel-lock status bit macros use '<' comparison instead of '<<' shift: SCDC_CH0_LOCK==0 (channel-0 lock undetectable) and SCDC_CH_LOCK_MASK aliases SCDC_CLOCK_DETECT

Summary

The header defines (1 < 3)/(1 < 2)/(1 < 1) - all evaluate to 1, 1, 0, so the mask collapses to 0x1 aliasing CLOCK_DETECT. Preprocessor-proven on the guest compiler (spec: 8/4/2/0xE). Zero in-tree consumers today (amdgpu DAL uses private constants) - latent logic defect for the first future consumer. Shift-operator fix.