fix recursive selects

target/config/Config.in.cpu

@@ -136,7 +136,7 @@ config ADK_CPU_XSCALE
 config ADK_CPU_M68K
 	bool
 	select ADK_TARGET_WITH_LT if ADK_LINUX_UCLINUX
-	select ADK_TARGET_WITH_MMU if !ADK_TARGET_WITH_MMU
+	select ADK_TARGET_WITH_MMU if !ADK_LINUX_UCLINUX
 	select ADK_TARGET_WITH_NPTL
 
 config ADK_CPU_MIPS32
@@ -157,7 +157,7 @@ config ADK_CPU_MIPS64
 config ADK_CPU_MICROBLAZE
 	bool
 	select ADK_TARGET_WITH_LT if ADK_TARGET_LIBC_UCLIBC_NG
-	select ADK_TARGET_WITH_MMU if !ADK_TARGET_WITH_MMU
+	select ADK_TARGET_WITH_MMU if !ADK_LINUX_UCLINUX
 	select ADK_TARGET_WITH_NPTL
 
 config ADK_CPU_ARM926EJ_S