xtensa-build-zephyr: disable XCC build for Intel cAVS hw

Recently merged rework of multicore support in Zephyr has
broken builds with XCC. Disable XCC based builds in CI until
issue is resolved in Zephyr mainline. Issue tracked as:
zephyrproject-rtos/zephyr#38349

Signed-off-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>

scripts/xtensa-build-zephyr.sh

@@ -129,18 +129,28 @@ build()
 				;;
 			cnl)
 				PLAT_CONFIG='intel_adsp_cavs18'
-				XTENSA_CORE="X6H3CNL_2017_8"
-				XTENSA_TOOLS_VERSION="RG-2017.8-linux"
+				# issues, tracked as
+				# https://github.com/zephyrproject-rtos/zephyr/issues/38349
+				unset XTENSA_TOOLS_ROOT
+				#XTENSA_CORE="X6H3CNL_2017_8"
+				#XTENSA_TOOLS_VERSION="RG-2017.8-linux"
+				# XCC build fails to a linker script compatibility
 				;;
 			icl)
 				PLAT_CONFIG='intel_adsp_cavs20'
-				XTENSA_CORE="X6H3CNL_2017_8"
-				XTENSA_TOOLS_VERSION="RG-2017.8-linux"
+				# issues, tracked as
+				# https://github.com/zephyrproject-rtos/zephyr/issues/38349
+				unset XTENSA_TOOLS_ROOT
+				#XTENSA_CORE="X6H3CNL_2017_8"
+				#XTENSA_TOOLS_VERSION="RG-2017.8-linux"
 				;;
 			tgl-h|tgl)
 				PLAT_CONFIG='intel_adsp_cavs25'
-				XTENSA_CORE="cavs2x_LX6HiFi3_2017_8"
-				XTENSA_TOOLS_VERSION="RG-2017.8-linux"
+				# issues, tracked as
+				# https://github.com/zephyrproject-rtos/zephyr/issues/38349
+				unset XTENSA_TOOLS_ROOT
+				#XTENSA_CORE="cavs2x_LX6HiFi3_2017_8"
+				#XTENSA_TOOLS_VERSION="RG-2017.8-linux"
 				RIMAGE_KEY=modules/audio/sof/keys/otc_private_key_3k.pem
 				;;
 			imx8)