adktest: enable printk

It is rather useful for debugging. So enable
printk and timing by default.

target/appliances/test.appliance

@@ -3,7 +3,6 @@ config ADK_APPLIANCE_TEST
 	select ADK_PACKAGE_ADKTEST
 	select ADK_RUNTIME_START_SERVICES
 	select ADK_RUNTIME_START_ADKTEST
-	select ADK_UCLIBC_TEST if ADK_TARGET_LIB_UCLIBC
 	select ADK_UCLIBC_TEST if ADK_TARGET_LIB_UCLIBC_NG
 	help
 	  Create a small appliance for automatic testing.

target/linux/config/Config.in.debug

@@ -39,13 +39,14 @@ config ADK_KERNEL_KALLSYMS_ALL
 config ADK_KERNEL_PRINTK
 	bool "printk support (disable to save space and quieten bootup)"
 	select ADK_KERNEL_EARLY_PRINTK
-	default y if !ADK_APPLIANCE_TEST
+	default y
 	help
 	  Disable printk to save space and quieten bootup.
 
 config ADK_KERNEL_PRINTK_TIME
 	bool "timing information for printk"
 	depends on ADK_KERNEL_PRINTK
+	default y
 	help
 	  Enable timing information for printk, to analyze kernel
 	  bootup performance.