arch/xtensa: Fix z_xtensa_cache_[flush|inv|flush_inv]_all functions

They were basically using the wrong instructions to traverse the cache
by index: `dhi`, `dhwb` and `dhwbi` instead of `dii`, `diwb` and `diwbi`
variants.

Fixes #49112.

Signed-off-by: Ederson de Souza <ederson.desouza@intel.com>