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dts:arm64:pbb: Set cma size of trizeps8plus to 320 MiB

Felix Gerking requested to merge trizeps8plus_set_cma_size_320M into linux-5.10.52-seco

By default, the cma size is set to 920MiB, which cannot be initialized on some of our some of our machines because the memory is too small. Previously, the cma value was bypassed by setting a suitable value in the kernel command line. To make the devicetree config usable, the cma size is set to 320 MiB. The value seems to be suitable for EGL surfaces and video playback.

BCS 746-001291

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