The od_rotate kernels were named after the trailing operation (where
 od_rotate_sub() meant that the last operation was a subtraction)
 which became less intuitive after we folded leading addition operation
 into the kernel.
This patch simply swaps the operations and kernel labels and has no
 change to the actual transform outputs.

Change-Id: I3d23f1d4aa9e47c78c849dcc6497f099ddcb3574