Add fdtbus_gpio_count(), which counts the number of GPIO entries
in a specified property.

Use queue(3) API to manage lists. NFCI.

Add fdtbus_gpio_acquire_index for accessing multi-xref gpios properties.

Memory leak, found by mootja; not tested, but obvious enough

Add fdtbus_gpio_{read,write}_raw, which tells the controller not to take
polarity into account. Tegra GPIO pin data includes pin polarity, but so
does a regulator-fixed node, so the end result was th

Add fdtbus_gpio_{read,write}_raw, which tells the controller not to take
polarity into account. Tegra GPIO pin data includes pin polarity, but so
does a regulator-fixed node, so the end result was that the enable value
was being swapped twice. Change fregulator to use the raw APIs, and adapt
Tegra and Exynos GPIO drivers to support this flag.

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Only OF_* functions should be in fdt_openfirm.c, move the rest to fdt_subr.c.

split gpio, i2c, intr, and regulator helpers into separate files