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linux-next: enable PMEM

Caleb Connolly requested to merge caleb/linux-next-pmem into master

PMEM aka persistent memory enables a region of memory to be treated as a block device. This is particularly useful as a way for EFI bootloaders to retrieve a full OS image (via HTTP) and make it accessible to the OS.

Support for this is making its way to U-Boot: https://lore.kernel.org/u-boot/20250203105912.196654-1-sughosh.ganu@linaro.org/

Let's enable this in postmarketOS so we can enable HTTP booting images directly from postmarketOS.org.

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