add prebuilt_sdk_system_api_android_txt module

Added a filegroup module prebuilt_sdk_system_api_android_txt.

Bug: 190635892
Test: TreeHugger
Change-Id: I6e699ba632c086b3373895825f78210e32ffd8f5
Merged-In: I6e699ba632c086b3373895825f78210e32ffd8f5
1 file changed