linux-phytec-ti

ARM: dts: imx6ul: Add SAI alias

Add SAI alias entries, which makes it possibe for the SAI driver
to retrieve the port instance.

Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>