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
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