bnxt_en: include bnxt_vfr.c code under CONFIG_BNXT_SRIOV switch

And define empty functions in bnxt_vfr.h when CONFIG_BNXT_SRIOV is not
defined.

This fixes build error when CONFIG_BNXT_SRIOV is switched off:
>> drivers/net/ethernet/broadcom/bnxt/bnxt_vfr.c:165:16: error: 'struct
>> bnxt' has no member named 'sriov_lock'
Reported-by: kbuild test robot <lkp@intel.com>
Fixes: 4ab0c6a8 ("bnxt_en: add support to enable VF-representors")
Signed-off-by: Sathya Perla <sathya.perla@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/broadcom/bnxt/bnxt_vfr.c

@@ -16,6 +16,8 @@
 #include "bnxt.h"
 #include "bnxt_vfr.h"
 
+#ifdef CONFIG_BNXT_SRIOV
+
 #define CFA_HANDLE_INVALID		0xffff
 #define VF_IDX_INVALID			0xffff
 
@@ -487,3 +489,5 @@ void bnxt_dl_unregister(struct bnxt *bp)
 	devlink_unregister(dl);
 	devlink_free(dl);
 }
+
+#endif

drivers/net/ethernet/broadcom/bnxt/bnxt_vfr.h

@@ -10,6 +10,8 @@
 #ifndef BNXT_VFR_H
 #define BNXT_VFR_H
 
+#ifdef CONFIG_BNXT_SRIOV
+
 #define	MAX_CFA_CODE			65536
 
 /* Struct to hold housekeeping info needed by devlink interface */
@@ -39,4 +41,32 @@ void bnxt_vf_reps_open(struct bnxt *bp);
 void bnxt_vf_rep_rx(struct bnxt *bp, struct sk_buff *skb);
 struct net_device *bnxt_get_vf_rep(struct bnxt *bp, u16 cfa_code);
 
+#else
+
+static inline int bnxt_dl_register(struct bnxt *bp)
+{
+	return 0;
+}
+
+static inline void bnxt_dl_unregister(struct bnxt *bp)
+{
+}
+
+static inline void bnxt_vf_reps_close(struct bnxt *bp)
+{
+}
+
+static inline void bnxt_vf_reps_open(struct bnxt *bp)
+{
+}
+
+static inline void bnxt_vf_rep_rx(struct bnxt *bp, struct sk_buff *skb)
+{
+}
+
+static inline struct net_device *bnxt_get_vf_rep(struct bnxt *bp, u16 cfa_code)
+{
+	return NULL;
+}
+#endif /* CONFIG_BNXT_SRIOV */
 #endif /* BNXT_VFR_H */