arc: use gcc9 and kernel 5.4 otherwise nsimdrv crashes

target/config/Config.in.compiler

@@ -18,6 +18,7 @@ default ADK_TOOLCHAIN_GCC_METAG if ADK_TARGET_ARCH_METAG
 default ADK_TOOLCHAIN_GCC_NDS32 if ADK_TARGET_ARCH_NDS32
 default ADK_TOOLCHAIN_GCC_7 if ADK_TARGET_CPU_ARM_ARM11MPCORE
 default ADK_TOOLCHAIN_GCC_7 if ADK_TARGET_CPU_ARM_CORTEX_A53
+default ADK_TOOLCHAIN_GCC_9 if ADK_TARGET_ARCH_ARC
 default ADK_TOOLCHAIN_GCC_9 if ADK_TARGET_ARCH_CSKY
 default ADK_TOOLCHAIN_GCC_9 if ADK_TARGET_ARCH_HPPA
 default ADK_TOOLCHAIN_GCC_9 if ADK_TARGET_ARCH_OR1K
@@ -45,6 +46,7 @@ config ADK_TOOLCHAIN_GCC_9
 
 config ADK_TOOLCHAIN_GCC_8
 	bool "8.4.0"
+	depends on !ADK_TARGET_ARCH_ARC
 	depends on !ADK_TARGET_ARCH_AVR32
 	depends on !ADK_TARGET_ARCH_CSKY
 	depends on !ADK_TARGET_ARCH_HPPA

target/linux/Config.in.kernelversion

@@ -23,6 +23,7 @@ default ADK_TARGET_LINUX_KERNEL_VERSION_4_9 if ADK_TARGET_ARCH_FRV
 default ADK_TARGET_LINUX_KERNEL_VERSION_4_9 if ADK_TARGET_CPU_ARM_ARM11MPCORE
 default ADK_TARGET_LINUX_KERNEL_VERSION_4_9 if ADK_TARGET_CPU_ARM_CORTEX_A53
 default ADK_TARGET_LINUX_KERNEL_VERSION_4_14 if ADK_TARGET_SYSTEM_QEMU_ARM_VERSATILEPB
+default ADK_TARGET_LINUX_KERNEL_VERSION_5_4 if ADK_TARGET_ARCH_ARC
 default ADK_TARGET_LINUX_KERNEL_VERSION_5_4 if ADK_TARGET_ARCH_CSKY
 default ADK_TARGET_LINUX_KERNEL_VERSION_5_4 if ADK_TARGET_ARCH_RISCV32
 default ADK_TARGET_LINUX_KERNEL_VERSION_5_4 if ADK_TARGET_ARCH_RISCV64