kasan: use MAX_PTRS_PER_* for early shadow tables

powerpc has a variable number of PTRS_PER_*, set at runtime based on the
MMU that the kernel is booted under.

This means the PTRS_PER_* are no longer constants, and therefore breaks
the build.  Switch to using MAX_PTRS_PER_*, which are constant.

Link: https://lkml.kernel.org/r/20210624034050.511391-5-dja@axtens.net
Signed-off-by: Daniel Axtens <dja@axtens.net>
Suggested-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Suggested-by: Balbir Singh <bsingharora@gmail.com>
Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Reviewed-by: Balbir Singh <bsingharora@gmail.com>
Reviewed-by: Marco Elver <elver@google.com>
Reviewed-by: Andrey Konovalov <andreyknvl@gmail.com>
Cc: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

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