qcacmn: Properly declare nbuf smmu map unmap

With NBUF_MEMORY_DEBUG=n and IPA_OFFLOAD=y, below errors are seen.

qdf/linux/src/qdf_nbuf.c:943:12: error: no previous prototype for function
'qdf_nbuf_smmu_map_debug' [-Werror,-Wmissing-prototypes]

qdf/linux/src/qdf_nbuf.c:955:12: error: no previous prototype for function
'qdf_nbuf_smmu_unmap_debug' [-Werror,-Wmissing-prototypes]

Currently above two APIs are only declared with NBUF_MEMORY_DEBUG=y.
Checking their definitions, could see that they have two variants
with NBUF_SMMU_MAP_UNMAP_DEBUG=y|n and they should only be valid
with IPA_OFFLOAD=y since IPA API is referenced in them.

Hence properly declare qdf_nbuf_smmu_map_debug() and
qdf_nbuf_smmu_unmap_debug() so that they're only valid with
IPA_OFFLOAD=y. With that, two variants are still kept.
With NBUF_SMMU_MAP_UNMAP_DEBUG=y, smmu map and unmap operations
are tracked. With NBUF_SMMU_MAP_UNMAP_DEBUG=n, no trackings are
maintained.

Change-Id: I83b08b1152d98b3efed3e52e564af0ebfbe5a7f7
CRs-Fixed: 3348594

qdf/linux/src/qdf_nbuf.c

@@ -860,6 +860,7 @@ void qdf_nbuf_map_check_for_smmu_leaks(void)
 	qdf_tracker_check_for_leaks(&qdf_nbuf_smmu_map_tracker);
 }
 
+#ifdef IPA_OFFLOAD
 QDF_STATUS qdf_nbuf_smmu_map_debug(qdf_nbuf_t nbuf,
 				   uint8_t hdl,
 				   uint8_t num_buffers,
@@ -906,6 +907,7 @@ QDF_STATUS qdf_nbuf_smmu_unmap_debug(qdf_nbuf_t nbuf,
 }
 
 qdf_export_symbol(qdf_nbuf_smmu_unmap_debug);
+#endif /* IPA_OFFLOAD */
 
 static void qdf_nbuf_panic_on_free_if_smmu_mapped(qdf_nbuf_t nbuf,
 						  const char *func,
@@ -934,7 +936,7 @@ static inline void qdf_net_buf_update_smmu_params(QDF_NBUF_TRACK *p_node)
 	p_node->smmu_map_iova_addr = 0;
 	p_node->smmu_map_pa_addr = 0;
 }
-#else
+#else /* !NBUF_SMMU_MAP_UNMAP_DEBUG */
 #ifdef NBUF_MEMORY_DEBUG
 static void qdf_nbuf_smmu_map_tracking_init(void)
 {
@@ -953,7 +955,7 @@ static void qdf_nbuf_panic_on_free_if_smmu_mapped(qdf_nbuf_t nbuf,
 static inline void qdf_net_buf_update_smmu_params(QDF_NBUF_TRACK *p_node)
 {
 }
-#endif
+#endif /* NBUF_MEMORY_DEBUG */
 
 #ifdef IPA_OFFLOAD
 QDF_STATUS qdf_nbuf_smmu_map_debug(qdf_nbuf_t nbuf,
@@ -979,8 +981,8 @@ QDF_STATUS qdf_nbuf_smmu_unmap_debug(qdf_nbuf_t nbuf,
 }
 
 qdf_export_symbol(qdf_nbuf_smmu_unmap_debug);
-#endif
-#endif
+#endif /* IPA_OFFLOAD */
+#endif /* NBUF_SMMU_MAP_UNMAP_DEBUG */
 
 #ifdef NBUF_MAP_UNMAP_DEBUG
 #define qdf_nbuf_map_tracker_bits 11 /* 2048 buckets */