arm64: dts: imx8mp-evk: add bt-sco sound card support

Add bt-sco sound card, which is used by BT HFP case.
It supports wb profile as default

Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
Reviewed-by: Daniel Baluta <daniel.baluta@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>