oniro-linux.conf: Fix wic deploy of overlay_map.dtb

overlay_map.dtb is to be deployed in the overlays subdirectory but
dunfell only decides on what to deploy there based on extension. An
exception for overlay_map.dtb was added in later versions but was never
backported as it only makes sense on newer kernel which dunfell doesn't
support. We fix this manually in IMAGE_BOOT_FILES.

Signed-off-by: Andrei Gherzan <andrei.gherzan@huawei.com>

meta-oniro-core/conf/distro/oniro-linux.conf

@@ -128,5 +128,7 @@ RPI_KERNEL_DEVICETREE_OVERLAYS_append = " \
     overlays/overlay_map.dtb \
     overlays/vc4-kms-v3d-pi4.dtbo \
 "
+IMAGE_BOOT_FILES_remove_rpi = "overlay_map.dtb"
+IMAGE_BOOT_FILES_append_rpi = " overlay_map.dtb;overlays/overlay_map.dtb"
 
 SPLASH = "psplash-oniro"