Move PRODUCT_COPY_FILES from each board>device-vendor.mk here

We used to put the firmware copy logic in dedicated device-vendor.mk
files for each platform. This approach is difficult to maintain and
unnecessary since we always want to deploy the latest firmware.
Propose a better approach for handling firmware copy logic.

Flag: EXEMPT refactor
Bug: 359071523
Test: Build pass
Change-Id: I4169353b9f8f16b82eb0e4ebf2a884f46e1a5f8b
1 file changed