libtimeinstate: fix map names

The maps defined by the time_in_state.c BPF program now have names
ending with "_map", so update our calls to bpf_obj_get() to reflect
that.

Test: libtimeinstate_test passes
Bug: 78498733
Change-Id: If13df157c0245561eee3efa2a9c5a04f339ca194
Signed-off-by: Connor O'Brien <connoro@google.com>
(cherry picked from commit cf9bc5fd)
Merged-In: If13df157c0245561eee3efa2a9c5a04f339ca194