dts: mnh-base: Increase ION carveout from 320MBs to 350MBs Relieves out of ION memory errors spot in production. Bug: 119781612 Change-Id: Ie37e4ffa0f249c6fcf1c64f7dcad6d86499d6ecf Signed-off-by: Cheng Gu <[email protected]>