Explicitly set 'generate_hashtree: false' for apexes used in apexer_test

apexer_test expects those test apexes not to have hashtree. Since we are
changing a default value of generate_hashtree to true, we need to
explicitly set it to false here.

Bug: 190621617
Test: atest --host apexer_test
Change-Id: Iebfb02f611d7eac35969b99daaa5eaa4413688dc
1 file changed