use busybox hush as default on noMMU

target/config/Config.in.runtime

@@ -269,7 +269,7 @@ config ADK_RUNTIME_KBD_LAYOUT
 
 choice
 prompt "initial login shell for the root user"
-default ADK_ROOTSH_SASH if ADK_TARGET_WITHOUT_MMU
+default ADK_ROOTSH_HUSH if ADK_TARGET_WITHOUT_MMU
 default ADK_ROOTSH_MKSH
 
 config ADK_ROOTSH_MKSH
@@ -322,7 +322,7 @@ endchoice
 
 choice
 prompt "system /bin/sh (POSIX script shell)"
-default ADK_BINSH_SASH if ADK_TARGET_WITHOUT_MMU
+default ADK_BINSH_HUSH if ADK_TARGET_WITHOUT_MMU
 default ADK_BINSH_MKSH
 
 config ADK_BINSH_MKSH
@@ -334,9 +334,9 @@ config ADK_BINSH_MKSH
 
 config ADK_BINSH_SASH
 	bool "sash (Standalone Shell)"
-	select ADK_PACKAGE_SASH if !ADK_TOOLCHAIN_ONLY
+	select ADK_PACKAGE_SASH
 	help
-	  hush shell.
+	  sash shell.
 
 config ADK_BINSH_HUSH
 	bool "hush (busybox)"