ANDROID: cuttlefish defconfig - enable mount/net/uts namespaces.

These configs are the default for qemu backed kernel net tests.

This matches:
  https://android-review.googlesource.com/c/kernel/configs/+/1320157


  R+: require mount/net/uts namespace support

Generated via:
  echo 'CONFIG_NAMESPACES=y' >> arch/arm64/configs/cuttlefish_defconfig
  make ARCH=arm64 cuttlefish_defconfig
  make ARCH=arm64 savedefconfig
  mv defconfig arch/arm64/configs/cuttlefish_defconfig

Test: treehugger
Bug: 144061615
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I1e15dc04116155ede485dd0458f55ee405fb285c