MAINTAINERS: Update for VMCI driver

Add maintainer info for the VMware VMCI driver.

v2: moved pv-drivers to L: as private list

Acked-by: Vishnu Dasa <vdasa@vmware.com>
Signed-off-by: Jorgen Hansen <jhansen@vmware.com>
Link: https://lore.kernel.org/r/1626861766-11115-1-git-send-email-jhansen@vmware.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>