qcacmn: Add API qdf_nbuf_reset to reset netbuf

This API makes the reuse of sk_buff possible, by resetting
it with the reserve and align arguments passed by the caller.

This brings back the skb to the original state as
returned by qdf_nbuf_alloc without allocating the skb again.

Change-Id: Idefcbd4be9fae5d140805d55207dec01bdc90237
CRs-Fixed: 2301899

qdf/inc/qdf_nbuf.h

@@ -1569,6 +1569,19 @@ static inline void qdf_nbuf_reserve(qdf_nbuf_t buf, qdf_size_t size)
 	__qdf_nbuf_reserve(buf, size);
 }
 
+/**
+ * qdf_nbuf_reset() - reset the buffer data and pointer
+ * @buf: Network buf instance
+ * @reserve: reserve
+ * @align: align
+ *
+ * Return: none
+ */
+static inline void qdf_nbuf_reset(qdf_nbuf_t buf, int reserve, int align)
+{
+	__qdf_nbuf_reset(buf, reserve, align);
+}
+
 /**
  * qdf_nbuf_peek_header() - return the data pointer & length of the header
  * @buf: Network nbuf