sound: soc: dapm: Implement non-recursive DAPM

sound: soc: dapm: Implement non-recursive DAPM

Implement is_connected_ep in a non-recursive way using
two auxiliary stacks and performing a post order traversal
of the DAPM graph.

Jira EMA-1095
Bug 2226733
Bug 200463529

Change-Id: Ia69c284a66c1f26ebf3a95ac8aa3e35a63bd817f
Signed-off-by: Niranjan Dighe <ndighe@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1945486
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Uday Gupta <udayg@nvidia.com>
Reviewed-by: Dipesh Gandhi <dipeshg@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Nitin Pai <npai@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>