Setting system to internal RC oscillator

Hi,

 I am using nRF connect SDK  V2.0.2 chipset 52832 built using VS code.

 Need to move the setup from an external clock to an internal RC oscillator.

 When I disable "Hardware Clock Controller Support" in KConfig I get errors. Not able to select any option in the "32Khz" clock source. Image attached. Please suggest how to enable the internal oscillator 

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