Use svc_reg instead of svc_register to register services.
svc_register does not handle IPv6, and portmapper never receives
registration calls for IPv6 services(mount,nlm,nfs) which are
required for v3. For v3 mount rpcbind fails to provide details in
response to the GETADDR call for mount:v6.

svc_reg handles the registration with rpcbind correctly.

Signed-off-by: Srikrishan Malik <srimalik@in.ibm.com>
Merge branch 'tp/ibm_next_20_ipv6_2' into ibm_next_20_tmp