loongarch: use gcc 13.x to fix Linux kernel compile issues

target/config/Config.in.compiler

@@ -20,6 +20,7 @@ default ADK_TOOLCHAIN_GCC_9 if ADK_TARGET_ARCH_BFIN && ADK_TARGET_BINFMT_FDPIC
 default ADK_TOOLCHAIN_GCC_10 if ADK_TARGET_ARCH_CRIS # no longer supported
 default ADK_TOOLCHAIN_GCC_10 if ADK_TARGET_CPU_SH_J2 # j2.patch
 default ADK_TOOLCHAIN_GCC_11 if ADK_TARGET_ARCH_SPARC # bus error without patch
+default ADK_TOOLCHAIN_GCC_13 if ADK_TARGET_ARCH_LOONGARCH
 default ADK_TOOLCHAIN_GCC_12
 
 config ADK_TOOLCHAIN_GCC_GIT
@@ -38,6 +39,7 @@ config ADK_TOOLCHAIN_GCC_12
 	bool "12.3.0"
 	depends on !ADK_TARGET_ARCH_AVR32
 	depends on !ADK_TARGET_ARCH_METAG
+	depends on !ADK_TARGET_ARCH_LOONGARCH
 	depends on !ADK_TARGET_ARCH_SPARC
 
 config ADK_TOOLCHAIN_GCC_11