Support specifying multiple implicit member signatures per class

Add support for processing implicitMember property for
UnsupportedAppUsage and also for handling repeated
UnsupportedAppUsage annotations.

Bug: 119861512
Test: atest class2greylisttest, m -j20 framework
Change-Id: I4cb86b3f23160c06e06894974d44eeff4e7d2d27