ENGR00289553 IPU dev:correct downsize overflow check in rot case

ENGR00289553 IPU dev:correct downsize overflow check in rot case

In rotation cases, the width and height of IPUv3 IC scaling block's
output should align with the width and height of IPUv3 IC rotation
block. And, users only tell the IPUv3 device driver about the parameters
of scaling block's input and rotation block's output. So, we need to
swap the width and height of rotation block in cache before we do
downsize(a functionality of the scaling block) overflow check.

This patch fixes the issue which can be reproduced by this unit test case:
/unit_tests/mxc_v4l2_output.out -iw 128 -ih 128 -ow 176 -oh 10 -r 90

Signed-off-by: Liu Ying <Ying.Liu@freescale.com>