Added Active Branches and IDM Controll to I2C#2

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jonas-t-s wants to merge 3 commits intoETH-PBL:mainfrom

Commits on Jul 25, 2025

Change FH101RF_IDM_CTRL to the default value of the FH101RF.
jonas-t-s
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Added IDM_CTRL and active korrelbranches to I2C. Bits left: 3)
jonas-t-s
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Document `(Active Branches << 2) | IDM_CTRL` usage in README.
jonas-t-s
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