feat(st): get pin_count from the gpio-ranges property

The "ngpios" property is deprecated and may be removed.
Use the "gpio-ranges" property where the last parameter of that
property is the number of available pins within that range.

Signed-off-by: Fabien Dessenne <fabien.dessenne@foss.st.com>
Change-Id: I28295412c7cb1246fc753cff0d447b6fdcdc4c0f
1 file changed