grunt/barla: add Realtek ALC5682 codec support

ALC5682 i2c address: 0x1A

BUG=b:171755306
BRANCH=master
TEST=emerge-grunt coreboot

Change-Id: I8bc571104bebe02acf86507774580effc808beb6
Signed-off-by: Kevin Chiu <Kevin.Chiu@quantatw.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/51708
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
diff --git a/src/mainboard/google/kahlee/mainboard.c b/src/mainboard/google/kahlee/mainboard.c
index c44da75..0a78b0c 100644
--- a/src/mainboard/google/kahlee/mainboard.c
+++ b/src/mainboard/google/kahlee/mainboard.c
@@ -99,6 +99,11 @@
 	picr_data_ptr = mainboard_picr_data;
 }
 
+void __weak variant_devtree_update(void)
+{
+	/* Override dev tree settings per board */
+}
+
 static void mainboard_init(void *chip_info)
 {
 	int boardid = board_id();
@@ -129,6 +134,8 @@
 		     GPP_CLK0_REQ_MAP_MASK,
 		     GPP_CLK0_REQ_MAP_CLK_REQ0 <<
 		     GPP_CLK0_REQ_MAP_SHIFT);
+
+	variant_devtree_update();
 }
 
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