target-xtensa: add dsp3400 core

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
target-xtensa: tune tests for dsp3400

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
target-xtensa: dsp3400 quirks

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
target-xtensa: add LSCI/LSCX group tests

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
target-xtensa: add FP0 group arithmetic tests

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
target-xtensa: add FP0 group conversion tests

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
target-xtensa: add FP1 group tests

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
xtensa: add check-fp target

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>