zebra: skip EVI setup if an ES is applied to a pseudo interface

zebra: skip EVI setup if an ES is applied to a pseudo interface

zebra maintains pseudo interface for hanging off user config after
the interface is deleted in the kernel. If an user tried to config
an ES against such an interface zebra would crash with the following
call stack -
    at zebra/zebra_evpn_mh.c:2095
    sysmac=sysmac@entry=0x55cfbadd3160) at zebra/zebra_evpn_mh.c:2258
    at zebra/zebra_evpn_mh.c:3222
    argv=<optimized out>, es_lid_str=<optimized out>, es_lid=1, no=0x0, vty=0x55cfbaf4c7b0)
    at zebra/zebra_evpn_mh.c:3222
    argv=<optimized out>) at ./zebra/zebra_evpn_mh_clippy.c:202
    vty=vty@entry=0x55cfbaf4c7b0, cmd=cmd@entry=0x0, filter=FILTER_RELAXED)
    at lib/command.c:1073

Ticket: CM-31702

Signed-off-by: Anuradha Karuppiah <anuradhak@cumulusnetworks.com>