Support for adding dark greylist members from annotations.

Currently, we support maxTargetSdk values of 26 & 28, corresponding to
the P blacklist (existing dark grey list) and upcoming Q blacklist.

For now, just put the two into the same list, as the runtime support to
distinguish between the two does not exist yet.

Bug: 114361293
Test: m
Change-Id: I2f8d206e8dd22afc6c0e98fb5e53b1d78a534125