selftests/mm: va_high_addr_switch: dynamically initialize testcases to enable LPA2 testing

JIRA: https://issues.redhat.com/browse/RHEL-130531

commit e4a4ba4
Author: Dev Jain <dev.jain@arm.com>
Date:   Wed May 22 12:34:35 2024 +0530

    selftests/mm: va_high_addr_switch: dynamically initialize testcases to enable LPA2 testing

    Post FEAT_LPA2, the Aarch64 Linux kernel extends higher address support to
    4K and 16K translation granules.  To support testing this out, we need to
    do away with static initialization of page size, while still maintaining
    the nice array of testcases; this can be achieved by initializing and
    populating the array as a stack variable, and filling in the page size and
    hugepage size at runtime.

    Link: https://lkml.kernel.org/r/20240522070435.773918-3-dev.jain@arm.com
    Signed-off-by: Dev Jain <dev.jain@arm.com>
    Suggested-by: Andrew Morton <akpm@linux-foundation.org>
    Cc: Anshuman Khandual <anshuman.khandual@arm.com>
    Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
    Cc: Shuah Khan <shuah@kernel.org>
    Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

Signed-off-by: Chunyu Hu <chuhu@redhat.com>

Author: Chunyu-Hu