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card insert/remove events on controllers that don't implement the insert and remove interrupts. Bridge drivers can set a new slot option, SDHCI_NON_REMOVABLE, to indicate non-removable media (such as eMMC). The sdhci driver will not enable insert/remove interrupts, and sdhci_generic_get_card_present() will always return true. Bridge drivers can set a new quirk, SDHCI_QUIRK_POLL_CARD_PRESENT, and the sdhci driver will not enable insert/remove interrupts, and instead will use a callout to poll the card-present status at 5 Hz. For bridge drivers that get notified of card insert/remove via gpio interrupts, there is a new sdhci_handle_card_present() function they can call from the gpio interrupt handler to inform the sdhci code of the event. In addition to adding these new features, the existing code to debounce card insertions was updated to use taskqueue_enqueue_timeout() instead of scheduling a callout to do the taskqueue_enqueue(). There is also now a comment explaining that insertion-debounce is what's going on -- it took me a long time to realize that's what the old sdhci_card_delay() routine was really doing. There is no functional difference between the old and new debounce code (I hope!).
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