fix: riscv64 efi conditional

missing a && between icicle and visionfive, led to /boot/efi still being
in place, and grub-install running instead of exiting the func.
fixes LP:2015750

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

@@ -455,7 +455,7 @@ EOF
 
             if [ "${SUBARCH:-}" != "nezha" ] && \
                [ "${SUBARCH:-}" != "licheerv" ] && \
-               [ "${SUBARCH:-}" != "icicle" ] \
+               [ "${SUBARCH:-}" != "icicle" ] && \
                [ "${SUBARCH:-}" != "visionfive" ] && \
                [ "${SUBARCH:-}" != "visionfive2" ]; then
                 ## TODO remove below once we have grub-efi-riscv64 for the platforms