boards: mimxrt685_evk/cm33: Update I2S sharing

Add SCK and WS signals to a shared signal set between Flexcomm #1 and
Flexcomm #3 for the mimxrt685_evk/mimxrt685s/cm33.

This enables the board to both transmit and receive audio, as the BCK
and WS signals produced by the WM8904 codec are only connected to the
Flexcomm #1 peripheral.

Signed-off-by: Vit Stanicek <vit.stanicek@nxp.com>

Author: VitekST

boards/nxp/mimxrt685_evk/cm33/init.c

@@ -24,6 +24,10 @@ void board_early_init_hook(void)
 	SYSCTL1->SHAREDCTRLSET[0] |= SYSCTL1_SHAREDCTRLSET_SHAREDDATASEL(3);
 	/* Enable Transmit I2S - Flexcomm 3 for Shared Data Out */
 	SYSCTL1->SHAREDCTRLSET[0] |= SYSCTL1_SHAREDCTRLSET_FC3DATAOUTEN(1);
+#else
+	/* Set shared signal set 0: SCK, WS from Flexcomm1 */
+	SYSCTL1->SHAREDCTRLSET[0] = SYSCTL1_SHAREDCTRLSET_SHAREDSCKSEL(1) |
+				SYSCTL1_SHAREDCTRLSET_SHAREDWSSEL(1);
 #endif
 
 	/* Set Receive I2S - Flexcomm 1 SCK, WS from shared signal set 0 */