Property 'dma-source' is not used anywhere, nor it is documented, so
let's just get rid of it.
Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
                                clock-names = "bus", "mclk1", "mclk2", "mclk3";
                                dma-names = "rx", "tx";
                                dmas = <&sdma 31 24 0>, <&sdma 32 24 0>;
-                               dma-source = <&gpr 0 15 0 16>;
                                status = "disabled";
                        };
 
                                clock-names = "bus", "mclk1", "mclk2", "mclk3";
                                dma-names = "rx", "tx";
                                dmas = <&sdma 33 24 0>, <&sdma 34 24 0>;
-                               dma-source = <&gpr 0 17 0 18>;
                                status = "disabled";
                        };