util/docker/coreboot-sdk: Drop subversion package

Subversion is not used anywhere (anymore?). Thus, drop it from the
package list.

Change-Id: Ibf8073c7878c130ff688102e850bbdcd66e3becc
Signed-off-by: Felix Singer <felixsinger@posteo.net>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/76082
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Elyes Haouas <ehaouas@noos.fr>

util/docker/coreboot-sdk/Dockerfile

@@ -75,7 +75,6 @@ RUN \
 		qemu-system-x86 \
 		rsync \
 		shellcheck \
-		subversion \
 		unifont \
 		uuid-dev \
 		vim-common \