d/control: qemu-system-riscv missing recommends
qemu-system-riscv needs the same/similar packages for
- booting via EDK II
- using the spice protocol
- using OpenGL
- special block devices
as qemu-system-arm and qemu-system-x86.
Add the missing recommends.
Signed-off-by: Heinrich Schuchardt heinrich.schuchardt@canonical.com