add mini.mk for common configurations for mini products

- it is used for generic pdk release

Bug: 6540216

Change-Id: I7dd21724a9484e48c66e4430cd003ffb448f075b
diff --git a/target/board/generic/device.mk b/target/board/generic/device.mk
index 843f038..737a607 100644
--- a/target/board/generic/device.mk
+++ b/target/board/generic/device.mk
@@ -25,8 +25,8 @@
 PRODUCT_COPY_FILES := \
     device/generic/goldfish/data/etc/apns-conf.xml:system/etc/apns-conf.xml \
     device/generic/goldfish/data/etc/vold.conf:system/etc/vold.conf \
-    development/tools/emulator/system/camera/media_profiles.xml:system/etc/media_profiles.xml \
-    development/tools/emulator/system/camera/media_codecs.xml:system/etc/media_codecs.xml \
+    $(call add-to-product-copy-files-if-exists,development/tools/emulator/system/camera/media_profiles.xml:system/etc/media_profiles.xml) \
+    $(call add-to-product-copy-files-if-exists,development/tools/emulator/system/camera/media_codecs.xml:system/etc/media_codecs.xml) \
     hardware/libhardware_legacy/audio/audio_policy.conf:system/etc/audio_policy.conf
 
 PRODUCT_PACKAGES := \