add common-clk symbol

target/linux/config/Config.in.misc

@@ -10,6 +10,9 @@ config ADK_LINUX_KERNEL_MFD_SYSCON
 config ADK_LINUX_KERNEL_OF
 	bool
 
+config ADK_LINUX_KERNEL_COMMON_CLK
+	bool
+
 config ADK_LINUX_KERNEL_FIRMWARE_IN_KERNEL
 	bool 
 	default y if ADK_LINUX_KERNEL_R8169 && ADK_LINUX_KERNEL_ROOT_NFS