rauc: Do not try to populate /etc/opkg/

Our initramfs images are supposed to be small and don't have a
/etc/opkg folder so attempting to put feed config in there will
fail. Reset the FEED_URIS that come from our local.conf.

recipes-core/images/image-rauc-install-initramfs.bb

@@ -7,6 +7,7 @@ PACKAGE_INSTALL = "initramfs-framework-base initramfs-module-debug initramfs-mod
 
 #export IMAGE_BASENAME = "core-image-minimal-initramfs"
 IMAGE_LINGUAS = ""
+FEED_URIS=""
 
 LICENSE = "MIT"
 

recipes-core/images/image-rauc-rescue-initramfs.bb

@@ -3,6 +3,7 @@ DESCRIPTION = "rescue initramfs"
 PACKAGE_INSTALL = "task-core-boot ${ROOTFS_PKGMANAGE_BOOTSTRAP} ${ROOTFS_PKGMANAGE} rauc dropbear"
 
 IMAGE_LINGUAS = ""
+FEED_URIS=""
 
 LICENSE = "MIT"
 

recipes-core/images/image-rauc-slot-initramfs.bb

@@ -7,6 +7,7 @@ PACKAGE_INSTALL = "initramfs-framework-base initramfs-module-debug initramfs-mod
 
 #export IMAGE_BASENAME = "core-image-minimal-initramfs"
 IMAGE_LINGUAS = ""
+FEED_URIS=""
 
 LICENSE = "MIT"