Revert "Detect the cable status when the USB function is enabled for the very first time after bootup."

This reverts commit fb1779d79fb0bf4ad6c9fda2f996a9e343edcadf.
Revert "SD: Disable mmc_attach_sd function"

This reverts commit b025d94a3dbd85f074ec230ef3a20da8fe141c03.