[Libvirt-cim] [PATCH 0 of 4] Add ResoucePool support for input and graphics devices

Having a resource pool for both input and graphics devices doesn't really make sense (as we won't be allocating these devices from a pool). But a pool instances is need to get the AC instances, which is then used to get the template RASDs of a device. So, for consistency with other devices, pools for graphics and input devices is added here.