support chinese character for ota package's path

It had been tested work well for both english characters 
and chinese english misc characters.
Because utf-8 is supported in recovery mode, so
if we stored message by utf-8 encoding, we can
handle non-ascii character for ota packages's path.

Change-Id: I19555dc75640bbfd481f23009bff511c07ae0bdb
Signed-off-by: aquanox <aquanox@163.com>

services/core/java/com/android/server/RecoverySystemService.java

@@ -285,8 +285,9 @@ public final class RecoverySystemService extends SystemService {
 
                 // Send the BCB commands if it's to setup BCB.
                 if (isSetup) {
-                    dos.writeInt(command.length());
-                    dos.writeBytes(command);
+                    byte[] cmdUtf8 = command.getBytes("UTF-8");
+                    dos.writeInt(cmdUtf8.length);
+                    dos.write(cmdUtf8, 0, cmdUtf8.length);
                     dos.flush();
                 }