add missing config symbol

SVN-Revision: 31364

target/linux/ps3/config-2.6.30

@@ -271,6 +271,7 @@ CONFIG_SCHED_OMIT_FRAME_POINTER=y
 # CONFIG_SCSI_PROC_FS is not set
 CONFIG_SCSI=y
 # CONFIG_SERIAL_8250 is not set
+# CONFIG_SERIAL_OF_PLATFORM is not set
 # CONFIG_SLOW_WORK is not set
 CONFIG_SMP=y
 CONFIG_SPARSEMEM_EXTREME=y