Add slf4j-api and slf4j-nop build targets am: 8079f0abd9

Original change: https://android-review.googlesource.com/c/platform/external/slf4j/+/2972903

Change-Id: I69419fd1c30a40955b7617bc53de4f037523e609
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>