Fix some warnng in lv2.cpp

rpcs3/Emu/Cell/lv2/sys_sync.h

@@ -23,6 +23,10 @@ enum lv2_protocol : u32
 	SYS_SYNC_PRIORITY            = 0x2, // Priority Order
 	SYS_SYNC_PRIORITY_INHERIT    = 0x3, // Basic Priority Inheritance Protocol
 	SYS_SYNC_RETRY               = 0x4, // Not selected while unlocking
+};
+
+enum : u32
+{
 	SYS_SYNC_ATTR_PROTOCOL_MASK  = 0xf,
 };