LF-352 arm: dts: imx6ul[l]-evk: increase CMA size to fix alloc failure for v4l2

LF-352 arm: dts: imx6ul[l]-evk: increase CMA size to fix alloc failure for v4l2

increase CMA size to 160MB to fix cma alloc failure for v4l2 capture case:

Capture_To_Display_mmap: mode 6(2592x1944)@15fps test.
...
[ 247.301290] cma: cma_alloc: alloc failed, req-size: 2461 pages, ret: -12
[ 247.308290] mx6s-csi 21c4000.csi: dma_alloc_coherent of size 10080256 failed
[ 247.317097] cma: cma_alloc: alloc failed, req-size: 2461 pages, ret: -12
...

Signed-off-by: Robby Cai <robby.cai@nxp.com>
Reviewed-by: Dong Aisheng <aisheng.dong@nxp.com>