CSI MIPI on X1/X1E: 128mb CMA is not enough, at least in some cases

Successfully tested this branch on Dell XPS 9345, Asus Zenbook A14, both cameras are eventually working.

OS: Ubuntu 25.04 Concept

In the initial state, on both devices camera got probed but the qcam would crash due to memory allocation issue. Increased CMA from 128mb to 256mb in grub config fixes it.

At present, DTs set CMA at 128mb. As not everyone is using grub, it would make sense to change DTs to have higher CMA directly. I would like to propose to extend all the camera bringup patches for X1/X1E laptops with CMA to 256mb.

ping @bodonoghue