the macro name(NETLINK_GENERIC ) of generic netlink family is conflicted with the old name defined in if_mib.h

[steven_chen3_dell.com]

Summary

the old name of NETLINK_GENERIC is used by interface MIB type query in SNMP, either we change the name of the old feature type, or we change the name of the new feature type, the netlink is added later, so we change the netlink macro name to NETLINK_GENERIC_NL.

Test Plan

Applications currently using the netlink generic type message.

[steven_chen3_dell.com]

D41842 is accepted , so please ignore it.

[steven_chen3_dell.com]

D41842 is accepted, so abandon it.