We add few product files in .mk files like below
44 PRODUCT_COPY_FILES += device/ti/blaze/apns.xml:system/etc/apns-conf.xml \
45 frameworks/base/data/etc/android.hardware.camera.flash-autofocus.xml:system/etc/permissions/android.hardware.camera.flash-autofocus.xml \
46 packages/wallpapers/LivePicker/android.software.live_wallpaper.xml:/system/etc/permissions/android.software.live_wallpaper.xml \
47 frameworks/base/data/etc/android.hardware.wifi.xml:system/etc/permissions/android.hardware.wifi.xml \
48 frameworks/base/data/etc/android.hardware.touchscreen.multitouch.distinct.xml:system/etc/permissions/android.hardware.touchscreen.multitouch.distinct.xml
or like in opencore, you can do simple copy with some add call routine (havent tried, but u can explore)
9 $(call add-prebuilt-files, ETC, pvplayer.cfg)
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Regards,
Deva