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Add new helper routines for sdhci bridge drivers that use gpio pins for
card presence and write protect switch detection.
Use the new sdhci_fdt_gpio helper functions to add full support for FDT
gpio pins for detecting card insert/remove and write protect for ti_sdhci.
Include sys/systm.h for use of bootverbose.
Revert to ti_sdhci driver's historic behavior: assume an sd card is
writable if the fdt data doesn't provide a gpio pin for reading the write
protect switch and also doesn't contain a "wp-disable" property.
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