ASoC: bt-sco: fix duplicate DAPM widget names for wideband DAI

ASoC: bt-sco: fix duplicate DAPM widget names for wideband DAI

The bt-sco-pcm-wb DAI uses the same stream_name strings as bt-sco-pcm
("Playback" and "Capture"). This causes duplicate DAPM AIF widget
names within the same component, leading to debugfs warnings:

  debugfs: 'Playback' already exists in 'dapm'
  debugfs: 'Capture' already exists in 'dapm'

Give the wideband DAI distinct stream names ("WB Playback" and
"WB Capture") and add corresponding DAPM AIF widgets and routes for
them.

Fixes: 5947e1b4992e ("ASoC: bt-sco: extend rate and add a general compatible string")
Assisted-by: VeroCoder:claude-sonnet-4-5
Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
Link: https://patch.msgid.link/20260715100620.1387159-1-shengjiu.wang@oss.nxp.com
Signed-off-by: Mark Brown <broonie@kernel.org>