cmake: Update Kconfig symbol name for 0.17 release

This commit updates the Kconfig symbol name for the SDK 0.17 release.

Signed-off-by: Stephanos Ioannidis <root@stephanos.io>

Author: stephanosio

cmake/zephyr/Kconfig

@@ -1,6 +1,6 @@
 # SPDX-License-Identifier: Apache-2.0
 
-config TOOLCHAIN_ZEPHYR_0_16
+config TOOLCHAIN_ZEPHYR_0_17
 	def_bool y
 	# FIXME: Newlib-nano is disabled for Xtensa targets due to the memset
         #        bug causing crashes (see the GitHub issue #660).