Revert "feat(uart): add uart7 support"

huangcm

2025-07-01 676035278781360996553c427a12bf358249ebf7

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{
global:
  EnsureFrontOfChain;
  AddSpecialSignalHandlerFn;
  RemoveSpecialSignalHandlerFn;
  sigaction;
  sigaction64;
  signal;
  sigprocmask;
  sigprocmask64;
local:
  *;
};