nds32: 6.1.x is not supported

target/linux/Config.in.kernelversion

@@ -21,6 +21,7 @@ default ADK_TARGET_LINUX_KERNEL_VERSION_4_9 if ADK_TARGET_SYSTEM_ST_STM32F429
 default ADK_TARGET_LINUX_KERNEL_VERSION_4_9 if ADK_TARGET_SYSTEM_ST_STM32F769
 default ADK_TARGET_LINUX_KERNEL_VERSION_4_9 if ADK_TARGET_SYSTEM_QEMU_ARM_VERSATILEPB
 default ADK_TARGET_LINUX_KERNEL_VERSION_5_4 if ADK_TARGET_ARCH_C6X
+default ADK_TARGET_LINUX_KERNEL_VERSION_5_15 if ADK_TARGET_ARCH_NDS32
 default ADK_TARGET_LINUX_KERNEL_VERSION_6_1
 
 config ADK_TARGET_LINUX_KERNEL_VERSION_GIT
@@ -43,6 +44,7 @@ config ADK_TARGET_LINUX_KERNEL_VERSION_6_1
 	depends on !ADK_TARGET_ARCH_CRIS
 	depends on !ADK_TARGET_ARCH_FRV
 	depends on !ADK_TARGET_ARCH_METAG
+	depends on !ADK_TARGET_ARCH_NDS32
 
 config ADK_TARGET_LINUX_KERNEL_VERSION_5_15
 	bool "5.15.120"