Fix the subarch used in the hook to identify images for sifive unmatched. LP: #2037060.

debian/changelog

@@ -1,3 +1,10 @@
+livecd-rootfs (23.10.44) UNRELEASED; urgency=medium
+
+  * Fix the subarch used in the hook to identify images for sifive
+    unmatched.  LP: #2037060.
+
+ -- Steve Langasek <steve.langasek@ubuntu.com>  Fri, 22 Sep 2023 01:48:25 -0700
+
 livecd-rootfs (23.10.43) mantic; urgency=medium
 
   * The unminimize script should install the lxd snap from the per-release

live-build/ubuntu-cpc/hooks.d/base/disk-image-uefi-non-cloud.binary

@@ -355,7 +355,7 @@ EOF
                         # This explains why we install flash-kernel here.
                         chroot mountpoint bash -c "echo 'StarFive VisionFive 2 v1.3B' > /etc/flash-kernel/machine"
                         ;;
-		    "sifive_unmatched")
+		    unmatched)
                         cp ${my_d}/riscv64/grub/90_watchdog-thresh.cfg mountpoint/etc/default/grub.d/
                         chroot mountpoint bash -c "echo 'SiFive HiFive Unmatched A00' > /etc/flash-kernel/machine"
                         chroot mountpoint apt-get install -qqy u-boot-sifive