ENGR00290654 IPUv3 dev:Workaround split mode downsize overflow

ENGR00290654 IPUv3 dev:Workaround split mode downsize overflow

The downsizing ratio overflow check should cover every stripe
in the split mode. We need to do the overflow check correctly
by taking the width/height 8-pixel alignment requirement into
consideration since the alignment would be done when every
stripe is checked in it's own ipu task.

This patch takes a workaround for the issue which can be
reproduced by this unit test case:

==================================================================
mxc_v4l2_output.out -iw 1920 -ih 1080 -ow 200 -oh 200 -v 1

mxc_ipu mxc_ipu: ERR:create_split_child_task() ret:-22
mxc_ipu mxc_ipu: sp_task[0],no-0x12 fail state:-22, queue err:-22.
mxc_ipu mxc_ipu: ERR: [0xac73ea00] no-0x10,state 3: error
mxc_ipu mxc_ipu: ERR: no-0x10,ipu_queue_task err:-125
mxc_v4l2_output v4l2_out.35: display work fail ret = -125
mxc_ipu mxc_ipu: ERR:create_split_child_task() ret:-22
mxc_ipu mxc_ipu: sp_task[0],no-0x22 fail state:-22, queue err:-22.
mxc_ipu mxc_ipu: ERR: [0xac73ea00] no-0x20,state 3: error
mxc_ipu mxc_ipu: ERR: no-0x20,ipu_queue_task err:-125
mxc_v4l2_output v4l2_out.35: display work fail ret = -125
mxc_ipu mxc_ipu: ERR:create_split_child_task() ret:-22
mxc_ipu mxc_ipu: sp_task[0],no-0x32 fail state:-22, queue err:-22.
mxc_ipu mxc_ipu: ERR: [0xac63c400] no-0x30,state 3: error
mxc_ipu mxc_ipu: ERR: no-0x30,ipu_queue_task err:-125
mxc_v4l2_output v4l2_out.35: display work fail ret = -125
VIDIOC_QBUF failed -1
==================================================================

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