Drop dkms from the riscv64 lichee images.

This was added for licheerv-rtl8723ds-dkms which is now dropped from
the archive (LP: #2059151).

debian/changelog

@@ -1,5 +1,8 @@
 livecd-rootfs (24.04.54) UNRELEASED; urgency=medium
 
+  [ Steve Langasek ]
+  * Drop dkms from the riscv64 lichee images.
+
   [ Erich Eickmeyer ]
   * Add chroot_early symlink for Ubuntu MATE
 

live-build/auto/config

@@ -1313,12 +1313,6 @@ case "$ARCH${SUBARCH:++$SUBARCH}" in
 		KERNEL_FLAVOURS="nvidia-$SUBARCH"
 		;;
 	riscv*+*)
-		if [ "${SUBARCH:-}" = "licheerv" ]; then
-			# The wifi driver of the licheerv is an out-of-tree driver packaged
-			# in universe for now, so to ease its installation for those without
-			# network, install its dependencies.
-			add_package install dkms
-		fi
 		# We'll add wpasupplicant to the seeds when we work on RISC-V seeds.
 		add_package install wpasupplicant
 		;;