soc/intel/alderlake: Add CNVi Bluetooth flag at devicetree entry

This change adds the corresponding CNVi BT Core enabling flag.
TEST: BT is checked using 'lsusb -d 8087:0026' from OS.

Change-Id: Iecc10c8946a450350adb34b984cf48ad988097ca
Signed-off-by: Cliff Huang <cliff.huang@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/51350
Reviewed-by: Furquan Shaikh <furquan@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/intel/alderlake/chip.h

@@ -206,6 +206,9 @@ struct soc_intel_alderlake_config {
 	/* Enable Pch iSCLK */
 	uint8_t pch_isclk;
 
+	/* CNVi BT Core Enable/Disable */
+	bool CnviBtCore;
+
 	/* CNVi BT Audio Offload: Enable/Disable BT Audio Offload. */
 	bool CnviBtAudioOffload;