pinctrl: intel: Try to retrieve driver data for pure platform drivers

The Denverton pinctrl device can be instantiated by the Intel LPC
driver as an MFD platform device named "denverton-pinctrl".

On affected systems the platform device does not carry the INTC3000
ACPI match data itself. As a result, intel_pinctrl_probe_by_hid()
fails to obtain the SoC data using device_get_match_data() and
returns -ENODATA.

This might be also true for other platforms that can be enumerated
by ACPI _HID. Fix the above by trying the pure platform driver data
in case the firmware node is not set or doesn't carry the necessary
information.

Reported-by: Radek Válko <rvalko@lipicko.cz>
Closes: https://lore.kernel.org/r/20260827184259.32386-1-rvalko@lipicko.cz
Tested-by: Radek Válko <rvalko@lipicko.cz>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>