Staging: et131x: kill MP_ERR_COUNTERS which is unused

#define LO_MARK_PERCENT_FOR_PSR     15

#define LO_MARK_PERCENT_FOR_RX      15

/* Counters for error rate monitoring */

typedef struct _MP_ERR_COUNTERS {

	u32 PktCountTxPackets;

	u32 PktCountTxErrors;

	u32 TimerBasedTxErrors;

	u32 PktCountLastError;

	u32 ErredConsecPackets;

} MP_ERR_COUNTERS, *PMP_ERR_COUNTERS;

/* RFD (Receive Frame Descriptor) */

typedef struct _MP_RFD {

	struct list_head list_node;