selftests/liveupdate: Move luo_test_utils.* into a reusable library

Move luo_test_utils.[ch] into a lib/ directory and make libliveupdate
library. Pull the rules to build them out into a separate
li

selftests/liveupdate: Move luo_test_utils.* into a reusable library

Move luo_test_utils.[ch] into a lib/ directory and make libliveupdate
library. Pull the rules to build them out into a separate
libliveupdate.mk script. This will enable these utilities to be
also built by and used within other selftests (such as VFIO).

Update path in vmtest.sh as that one uses hardcoded path for util.

No functional change intended.

Co-developed-by: David Matlack <dmatlack@google.com>
Signed-off-by: David Matlack <dmatlack@google.com>
Acked-by: Pratyush Yadav (Google) <pratyush@kernel.org>
Reviewed-by: Pasha Tatashin <pasha.tatashin@soleen.com>
Signed-off-by: Vipin Sharma <vipinsh@google.com>
Link: https://patch.msgid.link/20260720203202.1964557-3-vipinsh@google.com
Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org>

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