pstore updates for v6.9-rc1

- Make PSTORE_RAM available by default on arm64 (Nícolas F. R. A. Prado)

- Allow for dynamic initialization in modular build (Guilherme G. Piccoli)

- Add missing allocation failure check (Kunwu Chan)

- Avoid duplicate memory zeroing (Christophe JAILLET)

- Avoid potential double-free during pstorefs umount
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