dm: core: Allow access to the device's driver_id data

dm: core: Allow access to the device's driver_id data

When the device is created from a device tree node, it matches a compatible
string. Allow access to that string and the associated data.

Signed-off-by: Simon Glass <[email protected]>
Reviewed-by: Tom Rini <[email protected]>
Acked-by: Heiko Schocher <[email protected]>