libmeminfo_test: Use both product and board api level in the tests

For devices launching at S but with vendor implementation frozen at R
the tests should check both device api level ro.product.first_api_level
and board api level ro.board.first_api_level and use the minimum of
these values.

Bug: 203839958
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Change-Id: Ie56900dd18e10c9f6b087bccd3ee872cc42bc827
2 files changed