arm: rename xlnx-zcu102.canbusN properties

arm: rename xlnx-zcu102.canbusN properties

The properties to attach a CANBUS object to the xlnx-zcu102 machine have
a period in them.  We want to use periods in properties for compound QAPI types,
and besides the "xlnx-zcu102." prefix is both unnecessary and different
from any other machine property name.  Remove it.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-id: 20210118162537.779542-1-pbonzini@redhat.com
Reviewed-by: Vikram Garhwal <fnu.vikram@xilinx.com>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>