I just upgraded to Focal and yes, the issue just come back.

###### from dmesg ######
[    5.722325] dwc2 fe980000.usb: fe980000.usb supply vusb_d not found, using 
dummy regulator
[    5.722385] dwc2 fe980000.usb: fe980000.usb supply vusb_a not found, using 
dummy regulator
[    5.722541] dwc2 fe980000.usb: Configuration mismatch. dr_mode forced to host

So unlikely the compilation flag is applied to the current Focal kernel.

###### from dpkg -l ######
ii  linux-raspi2                         5.4.0.1011.11

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https://bugs.launchpad.net/bugs/1861070

Title:
  Raspberry Pi 4B: USB OTG is not working

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