Fix test module name mismatch for checkpoint test.

I tried to run this test with atest and failed; turned out this was due
to the fact that there's a mismatch between the module names declared
in Android.mk and AndroidTest.xml.

Test: atest VtsKernelCheckpointTest
Change-Id: I7ca83e2d6f1a496c66ff55c87b0657fef67377b3
1 file changed