libxc: add xc_domain_remove_from_physmap to wrap XENMEM_remove_from_physmap

libxc: add xc_domain_remove_from_physmap to wrap XENMEM_remove_from_physmap

This is for the proposal "Allow setting up shared memory areas between VMs
from xl config file". See:

  https://lists.xen.org/archives/html/xen-devel/2017-08/msg03242.html

Then plan is to use XENMEM_add_to_physmap_batch to map the shared pages from
one domU to another and use XENMEM_remove_from_physmap to cancel the sharing.
A wrapper to XENMEM_add_to_physmap_batch was added in the following commit:

  commit 20e725e9364cff4a29945f66986ecd88cca8743d

Now add the wrapper to XENMEM_remove_from_physmap.

Signed-off-by: Zhongze Liu <blackskygg@gmail.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
Acked-by: Wei Liu <wei.liu2@citrix.com>