They are not consecutive with DAC1_FRAME* and DAC2_FRAME*; Coverity
still complains about es1370_read, while es1370_write was fixed in
commit cf9270e5220671f49cc238deaf6136669cc07ae1.
Fixes: 154c1d1f960c5147a3f8ef00907504112f271cd8
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>