fdt: Add a function to get the index of a string

fdt: Add a function to get the index of a string

Given a device tree node and a property name, the new fdt_find_string()
function will look up a given string in the string list contained in the
property's value and return its index.

Signed-off-by: Thierry Reding <[email protected]>
Acked-by: Simon Glass <[email protected]>