m68k: defconfig: Update defconfigs for v5.18-rc1

  - Drop CONFIG_BINFMT_AOUT=m (no longer available since commit
    19e8b701 ("a.out: Stop building a.out/osf1 support on alpha
    and m68k")),
  - Enable modular build of the SM3 digest algorithm (no longer
    auto-selected since commit 11400469 ("crypto: sm2 - make
    dependent on sm3 library")),
  - Drop CONFIG_CRC64=m (auto-selected since commit a7d4383f
    ("block: add pi for extended integrity")),
  - Drop CONFIG_TEST_OVERFLOW=m (replaced by auto-modular
    CONFIG_OVERFLOW_KUNIT_TEST in commit 617f55e2 ("lib:
    overflow: Convert to Kunit")),
  - Drop CONFIG_TEST_STACKINIT=m (replaced by auto-modular
    CONFIG_STACKINIT_KUNIT_TEST in commit 02788ebc ("lib:
    stackinit: Convert to KUnit")).

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Link: https://lore.kernel.org/r/2ca38d8de70fc9fad5ad17fb81d04736effa181d.1649066720.git.geert@linux-m68k.org