feat(fix): close ar100s uart7 debug

huangcm

2025-07-03 a76b2fadf6ad4adf86e241e3753a63efe03ef80c

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# Bug component: 452972
timvp@google.com
alanward@google.com
cnorthrop@google.com
courtneygo@google.com
ianelliott@google.com
tobine@google.com