Adding make files with the new read-only product property
ro.product.first_api_level for Android L, L MR1 and M.

These make files can be inherited from the device.mk
file to indicate the first API level the device has been
commercially launched on.

Change-Id: I6f8e696ab81ca03b55bcf4c17b1e5972fe1d9c3b
4 files changed