[FEATURE] Card interrupts for RPi4B

[linguini1]

Is your feature request related to a problem? Please describe.

The current support for the EMMC2 interface on the Raspberry Pi 4B does not have implemented card interrupts (see #17245). The hardware itself has a card-detect pin on the EMMC2 slot and the EMMC2 controller has interrupts for card insertion/removal, so it should be possible to trigger them. However, the implementation does not seem to get an interrupt trigger on insertion/removal despite enabling those interrupts.

Describe the solution you'd like

More troubleshooting is necessary to determine why those interrupts don't fire so that there is proper support for card hot-swapping.

Describe alternatives you've considered

No response

Verification

• [x] I have verified before submitting the report.