kconfig: make defconfig is no longer chatty

make defconfig generated a lot of output
then noone actually read.
Use conf_set_all_new_symbols() to generate the default
configuration and avoid the chatty output.

A typical run now looks like this:
$ make defconfig
*** Default configuration is based on 'i386_defconfig'
arch/x86/configs/i386_defconfig:13:warning: trying to assign nonexistent symbol SEMAPHORE_SLEEPERS
arch/x86/configs/i386_defconfig:176:warning: trying to assign nonexistent symbol PREEMPT_BKL
...
arch/x86/configs/i386_defconfig:1386:warning: trying to assign nonexistent symbol INSTRUMENTATION
$

As an added benefit we now clearly see the warnings generated
in the start of the process.

Signed-off-by: Sam Ravnborg <[e-mail]>
Cc: Roman Zippel <[e-mail]>

scripts/kconfig/conf.c

···
 		fflush(stdout);
 		fgets(line, 128, stdin);
 		return 1;
-	case set_default:
-		printf("%s\n", def);
-		return 1;
 	default:
 		break;
 	}
···
 				cnt = atoi(line);
 			else
 				continue;
-			break;
-		case set_default:
-			cnt = def;
-			printf("%d\n", cnt);
 			break;
 		default:
 			break;
···
 	case set_random:
 		conf_set_all_new_symbols(def_random);
 		break;
+	case set_default:
+		conf_set_all_new_symbols(def_default);
+		break;
 	case ask_silent:
 	case ask_new:
 		if (conf_silent_update())
 			exit(1);
 		break;
 	case ask_all:
-	case set_default:
 		if (conf_update())
 			exit(1);
 		break;