xtensa: cavs: all cAVS versions have to select ARCH_HAS_COHERENCE

Currently only cAVS 1.5 Kconfig selects ARCH_HAS_COHERENCE,
which is wrong. cAVS 1.8, 2.0 and 2.5 have to select it too.

Signed-off-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>