xtensa: remove CONFIG_XTENSA_INVALIDATE_MEM_DOMAIN_TLB_ON_SWAP

Remove CONFIG_XTENSA_INVALIDATE_MEM_DOMAIN_TLB_ON_SWAP as it is
remnant from early MMU enabling work which is not needed as
the page table code is different from early version where
the PTEVADDR would be the same for all memory domains.

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