msm: camera: smmu: Enhance debug capability for camera memmgr

Improve debugging infrastructure and logging for memory related
issues. There are scenarios where the fd returned after ion_alloc
exists in camera smmu table as being mapped [stale entry].
On such scenarios, this change will return a specific error code to
userspace. The change also propagates the mapped size back to
user space.

CRs-Fixed: 2663114
Change-Id: Ia797b65d1e8ded58dec5b01df07d73262c4cfa95
Signed-off-by: Karthik Anantha Ram <kartanan@codeaurora.org>

include/uapi/camera/media/cam_req_mgr.h

@@ -343,12 +343,12 @@ struct cam_mem_alloc_out_params {
 /**
  * struct cam_mem_map_out_params
  * @buf_handle: buffer handle
- * @reserved: reserved for future
+ * @size: size of the buffer being mapped
  * @vaddr: virtual address pointer
  */
 struct cam_mem_map_out_params {
 	__u32 buf_handle;
-	__u32 reserved;
+	__u32 size;
 	__u64 vaddr;
 };