qcacmn: Implement WMI/Credit History log print APIs

Create output agnostic log print APIs for WMI and Credit History to
enhance the debugging experience.

Change-Id: Ie89a9cb3b54c373ac2610d62003e940da17696d8
CRs-Fixed: 2028762

wmi_unified_priv.h

@@ -113,12 +113,14 @@ struct wmi_command_header {
  * @ buf_tail_idx - Tail index of buffer
  * @ p_buf_tail_idx - refernce to buffer tail index. It is added to accommodate
  * unified design since MCL uses global variable for buffer tail index
+ * @ size - the size of the buffer in number of entries
  */
 struct wmi_log_buf_t {
 	void *buf;
 	uint32_t length;
 	uint32_t buf_tail_idx;
 	uint32_t *p_buf_tail_idx;
+	uint32_t size;
 };
 
 /**