arm64: dts: freescale: verdin-imx8mp: dahlia: add sound card

Add WM8904 based analog sound card to Dahlia carrier board.

Signed-off-by: Francesco Dolcini <francesco.dolcini@toradex.com>
Tested-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>