qcacmn: Remove ol_defines dependency from WMI layer

ol_defines header inclusion is invalid in WMI layer.
Remove the header inclusion by abstracting the dependency
with in WMI layer.

Change-Id: I5eb8624605cde20b516a1d8d0c823996c363e119
CRs-Fixed: 2023821

wmi_unified_param.h

@@ -302,6 +302,19 @@
 #define MAX_ASSOC_IE_LENGTH 1024
 typedef uint32_t TARGET_INIT_STATUS;
 
+/**
+ * @brief Opaque handle of wmi structure
+ */
+struct wmi_unified;
+typedef struct wmi_unified *wmi_unified_t;
+
+typedef void *ol_scn_t;
+/**
+ * @wmi_event_handler function prototype
+ */
+typedef int (*wmi_unified_event_handler)(ol_scn_t scn_handle,
+		 uint8_t *event_buf, uint32_t len);
+
 typedef enum {
 	WMI_HOST_MODE_11A	= 0,   /* 11a Mode */
 	WMI_HOST_MODE_11G	= 1,   /* 11b/g Mode */