soc: intel_adsp/ace: use CONFIG_XTENSA_MORE_SPIN_RELAX_NOPS

This enables the use of CONFIG_XTENSA_MORE_SPIN_RELAX_NOPS to
specify how many NOPs for arch_spin_relax(). This is to keep
the atomic_cas() (via s32c1i) from saturating the internal bus
with contant RCW ops. The numbers should be further tuned
for specific application but these should provide a good start.

Signed-off-by: Daniel Leung <daniel.leung@intel.com>