soc: nordic: nrf54h: power: Enable cache as early as possible

Add nrf_cache_power_up and nrf_cache_power_down functions. In case of
s2ram power up cache as early as possible, before restoring ARM core
registers. It improves restore time from 180 us to 33 us.

As a minor optimization nrf_memconf_ramblock_control_mask_enable_set is
used which allows to control ram blocks for icache and dcache in a
single register write.

Signed-off-by: Krzysztof Chruściński <krzysztof.chruscinski@nordicsemi.no>