Convert PRODUCT_COPY_FILES for keyboards data to Android.bp

This is the reland of aosp/3550700, and with ag/32711365 no extra change is needed.

go/abtd/run/L61500030010758908 tested the broken targets.

Bug: 401370820
Test: presubmits
Flag: EXEMPT refactor
Change-Id: Ic939e309a3bec09ae016ccc782e10310966941a5
2 files changed