MLK-9684-3: ASoC: imx-si476x: SRCK and SRFS is used for fm in imx6sx

Configure the aumux port to output SRCK and SRFS from STCK and STFS
of internal port when use the SYN mode.

Signed-off-by: Shengjiu Wang <shengjiu.wang@freescale.com>
(cherry picked from commit f4428f5617)

sound/soc/fsl/imx-si476x.c

@@ -32,6 +32,16 @@ static int imx_audmux_config(int slave, int master)
 	pdcr = IMX_AUDMUX_V2_PDCR_RXDSEL(slave);
 	imx_audmux_v2_configure_port(master, ptcr, pdcr);
 
+	/*
+	 * According to RM, RCLKDIR and SYN should not be changed at same time.
+	 * So separate to two step for configuring this port.
+	 */
+	ptcr |= IMX_AUDMUX_V2_PTCR_RFSDIR |
+		IMX_AUDMUX_V2_PTCR_RFSEL(slave) |
+		IMX_AUDMUX_V2_PTCR_RCLKDIR |
+		IMX_AUDMUX_V2_PTCR_RCSEL(slave);
+	imx_audmux_v2_configure_port(master, ptcr, pdcr);
+
 	ptcr = IMX_AUDMUX_V2_PTCR_SYN;
 	pdcr = IMX_AUDMUX_V2_PDCR_RXDSEL(master);
 	imx_audmux_v2_configure_port(slave, ptcr, pdcr);