soc: nordic: nrf54h20: Make HSFLL trims optional

If no HSFLL needs trimming, then `trim_hsfll()` should be compiled out.
This makes it easier to reuse the rest of `soc.c` out of tree.

Furthermore, some HSFLL instances can be trimmed before booting Zephyr,
so the FICR client properties in the DT binding should not be required.

Signed-off-by: Grzegorz Swiderski <grzegorz.swiderski@nordicsemi.no>