ASoC: qdsp6: q6asm-dai: Only add routing once.

q6asm routing gets added multiple times as part of dai probe.
Move this to q6routing routes which has those widgets defined, this also
fixes the issue where these are added each time at dai probe.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Mark Brown <broonie@kernel.org>