include/linux/jhash.h: replace __get_unaligned_cpu32 in jhash function

__get_unaligned_cpu32() is deprecated.  So, replace it with the more
generic get_unaligned() and just cast the input parameter.

Link: https://lkml.kernel.org/r/20250603132121.3674066-1-julian@outer-limits.org


Signed-off-by: Julian Vetter <julian@outer-limits.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Wei-Hsin Yeh <weihsinyeh168@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>