libtuning: Remove need for Cam object from ccm

Remove the need for the Cam object, as we don't want to port
it from Raspberry Pi.

Signed-off-by: Stefan Klug <stefan.klug@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>

utils/tuning/libtuning/ctt_ccm.py

@@ -62,9 +62,8 @@ FInds colour correction matrices for list of images
 """
 
 
-def ccm(Cam, cal_cr_list, cal_cb_list):
+def ccm(imgs, cal_cr_list, cal_cb_list):
     global matrix_selection_types, typenum
-    imgs = Cam.imgs
     """
     standard macbeth chart colour values
     """