selftests/liveupdate: Use luo_test_utils.c for liveupdate ioctl APIs

Use luo_test_utils.c for all live update ioctl calls. Remove direct
ioctl calls in liveupdate.c. This avoids code duplication and use common
interface.

While at it, make ioctl error check stricter as liveupdate APIs don't
return postive numbers as a valid result.

Co-developed-by: David Matlack <dmatlack@google.com>
Signed-off-by: David Matlack <dmatlack@google.com>
Reviewed-by: Pasha Tatashin <pasha.tatashin@soleen.com>
Reviewed-by: Pratyush Yadav (Google) <pratyush@kernel.org>
Signed-off-by: Vipin Sharma <vipinsh@google.com>
Link: https://patch.msgid.link/20260720203202.1964557-2-vipinsh@google.com
Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org>

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