disable gcc 5.2.x for FR-V, need to report a bug

target/config/Config.in.gcc

@@ -27,6 +27,7 @@ config ADK_TOOLCHAIN_GCC_5_2_0
 	depends on !ADK_TARGET_ARCH_AVR32
 	depends on !ADK_TARGET_ARCH_BFIN
 	depends on !ADK_TARGET_ARCH_C6X
+	depends on !ADK_TARGET_ARCH_FRV
 	depends on !ADK_TARGET_ARCH_H8300
 	depends on !ADK_TARGET_ARCH_METAG
 	depends on !ADK_TARGET_ARCH_OR1K