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powerpc: Explicitly disable CRASH_DUMP on 32-bit

Dave Vasilevsky requested to merge vasi/linux:ppc-crash-dump into master

Kernels 6.9+ are failing to boot on 32-bit PPC machines, when using Open Firmware. This has been verified to be caused by CRASH_DUMP, which changed to default 'y' in 6.9. Since OF is the most common way of booting 32-bit PPC, best to just force CRASH_DUMP off.

Work is ongoing upstream to fix the default value, but in the meantime let's get Debian un-broken, and make sure it doesn't break again later.

Initial bug report: https://lists.debian.org/debian-powerpc/2024/07/msg00001.html Debian bug: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1079725 The commit in 6.9 that caused it to turn on: https://github.com/torvalds/linux/commit/75bc255a7444801d64c7a7bd09e3f452f86b3585

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