Add eakammer and patricearruda to OWNERS

per-file * = asmundak@google.com,ccross@android.com,dwillemsen@google.com,jungjw@google.com,paulduffin@google.com

per-file * = asmundak@google.com

per-file * = ccross@android.com

per-file * = dwillemsen@google.com

per-file * = eakammer@google.com

per-file * = jungjw@google.com

per-file * = patricearruda@google.com

per-file * = paulduffin@google.com

per-file ndk_*.go, *gen_stub_libs.py = danalbert@google.com

per-file clang.go,global.go = srhines@google.com, chh@google.com, pirama@google.com, yikong@google.com