• Check the slot type capability, set SDHCI_SLOT_{EMBEDDED,NON_REMOVABLE} for embedded slots. Fail in the sdhci(4) initialization for slot type shared, which is completely unsupported by this driver at the moment. [1] For Intel eMMC controllers, taking the embedded slot type into account obsoltes setting SDHCI_QUIRK_ALL_SLOTS_NON_REMOVABLE so remove these quirk entries.
• Hide the 1.8 V VDD capability when the slot is detected as non-embedded, as the SDHCI specification explicitly states that 1.8 V VDD is applicable to embedded slots only. [2]
• Define some easy bits of the SDHCI specification v4.20. [3]
• Don't leak bus_dma(9) resources in failure paths of sdhci_init_slot().

Obtained from: DragonFlyBSD 65704a46 [1], 7ba10b88 [2], 0df14648 [3]