usdhc does not support card check notification


   In disk_access_usdhc.c, there is a callback for detect card but no API is open to the application layer. Therefore, during card insert / un-insert, the application layer will not be able to respond, such as mount fs when the card is inserted, and unmount fs when it is unplugged. I plan to add a mechanism to register the application layer callback in ioctrl Can anyone give some suggestions on the design expectations of zephyr? If the answer is yes, I will start the work

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