rauc: Increase maximum download size to 1 GiB

Default is 8 MiB which is, you know, not alot. Choose a very high
value and let the OS notify RAUC when the disk is full.

board/aarch64/rootfs/etc/rauc/system.conf

@@ -4,6 +4,7 @@ bootloader=uboot
 statusfile=/mnt/aux/rauc.status
 mountprefix=/var/lib/rauc/mnt
 bundle-formats=-plain
+max-bundle-download-size=1073741824
 
 [keyring]
 directory=/etc/rauc/keys

board/x86_64/rootfs/etc/rauc/system.conf

@@ -5,6 +5,7 @@ grubenv=/mnt/aux/grub/grubenv
 statusfile=/mnt/aux/rauc.status
 mountprefix=/var/lib/rauc/mnt
 bundle-formats=-plain
+max-bundle-download-size=1073741824
 
 [keyring]
 directory=/etc/rauc/keys