CHROMIUM: WAR: Increase CMA allocation to 256 MB

-This is required as some tflite models fails with
 current allocation

BUG=b:132147953
TEST=None

Signed-off-by: Abhinav Asati <asatiabhi@codeaurora.org>
Change-Id: Ib3bceff635d21c56535b028c2d055c9260db0935
Signed-off-by: Vamsi Singamsetty <vamssi@codeaurora.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/1590391


Reviewed-by: Zhihong Yu <zhihongyu@chromium.org>
Reviewed-by: Govind Singh <govinds@qualcomm.corp-partner.google.com>
Commit-Queue: Zhihong Yu <zhihongyu@chromium.org>
Tested-by: Zhihong Yu <zhihongyu@chromium.org>