Merge branch 'bpf-fix-a-few-test-failures-with-64k-page-size'

Yonghong Song says:

====================
bpf: Fix a few test failures with 64K page size

Changelog:
  v2 -> v3:
    - v2: https://lore.kernel.org/bpf/20250611171519.2033193-1-yonghong.song@linux.dev/
    - Add additional comments for xdp_adjust_tail test.
    - Use actual kernel page size to set new_len for Patch 2 tests.
  v1 -> v2:
    - v1: https://lore.kernel.org/bpf/20250608165534.1019914-1-yonghong.song@linux.dev/
    - For xdp_adjust_tail, let kernel test_run can handle various page sizes for xdp progs.
    - For two change_tail tests, make code easier to understand.
    - Resolved a new test failure (xdp_do_redirect).
====================

Link: https://patch.msgid.link/20250612035027.2207299-1-yonghong.song@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>