Fix two bugs in cpu_ref

- Make correct parameters for x86 IntrinsicConvolve5x5
- Use correct intrinsic ID for loopFilter

Change-Id: I5180b9e2a80a6e023299963b19bf8b4dcd4ebd4b
Signed-off-by: Yong Chen <yong.a.chen@intel.com>
Merge "Fix two bugs in cpu_ref"