asoc: bolero: Update SWR TX moved to AO region

In bengal target, SWR TX moved to AO region.
Update SWR TX as child of VA macro and handle
respective SWR register/clock sequences from
VA macro.

Change-Id: I6b632ce56a885f2ccc8516840b0e5d270fe0b2c0
Signed-off-by: Laxminath Kasam <lkasam@codeaurora.org>