asoc: codecs: add child devices after completing initialization

In bolero-cdc and tx, va, wsa and rx macros, move schedule_work call to
add the child devices to the point later to where the parent
initialization gets completed.

Change-Id: Iaa07329a25020dde21d9249c3848bb7fcf7d816a
Signed-off-by: Vangala, Amarnath <avangala@codeaurora.org>