Replace first_api_level with getLaunchApiLevel in vts-kernel

If ro.product.first_api_level is 0, getLaunchApiLevel assumes the device
is a newly launched product. It returns ro.build.version.sdk which is
defined by the system image.

Bug: 77142177
Test: vts-tradefed run commandAndExit vts --include-filter \
      VtsKernelVersion --include-filter KernelProcFileApiTest

Change-Id: I5b1c598180d3ad539184c7f417357e1f2b528f2d
2 files changed