add some mips32 cpu symbols

target/config/Config.in.cpu

@@ -653,6 +653,7 @@ config ADK_TARGET_CPU_MIPS_MIPS32
 	select ADK_TARGET_WITH_NPTL
 	select ADK_TARGET_WITH_MMU
 	select ADK_TARGET_CPU_WITH_FPU
+	select ADK_KERNEL_CPU_MIPS32_R1
 	depends on ADK_TARGET_ARCH_MIPS
 
 config ADK_TARGET_CPU_MIPS_MIPS32R2
@@ -660,6 +661,7 @@ config ADK_TARGET_CPU_MIPS_MIPS32R2
 	select ADK_TARGET_WITH_NPTL
 	select ADK_TARGET_WITH_MMU
 	select ADK_TARGET_CPU_WITH_FPU
+	select ADK_KERNEL_CPU_MIPS32_R2
 	depends on ADK_TARGET_ARCH_MIPS
 
 config ADK_TARGET_CPU_MIPS_MIPS32R6
@@ -667,6 +669,7 @@ config ADK_TARGET_CPU_MIPS_MIPS32R6
 	select ADK_TARGET_WITH_NPTL
 	select ADK_TARGET_WITH_MMU
 	select ADK_TARGET_CPU_WITH_FPU
+	select ADK_KERNEL_CPU_MIPS32_R6
 	depends on ADK_TARGET_ARCH_MIPS
 
 # mips64

target/linux/config/Config.in.mips

@@ -1,6 +1,15 @@
 # This file is part of the OpenADK project. OpenADK is copyrighted
 # material, please see the LICENCE file in the top-level directory.
 
+config ADK_KERNEL_CPU_MIPS32_R1
+	bool
+
+config ADK_KERNEL_CPU_MIPS32_R2
+	bool
+
+config ADK_KERNEL_CPU_MIPS32_R6
+	bool
+
 menu "MIPS devices support"
 depends on ADK_TARGET_SYSTEM_LEMOTE_YEELONG