libifconfig: Remove ifconfig_set_fib and ifconfig_sfp_id_is_qsfp

[saheed]

Summary

Removed the declaration of ifconfig_set_fib from libifconfig.h as it had no
definition.

ifconfig_sfp_id_is_qsfp is defined as a static header function in
libifconfig_sfp.h and doesn't generate a symbol.

Both have been removed from Symbol.map

[saheed]

Append "Sponsored by: Google LLC (GSoC)" to commits

[obiwac]

lib/libifconfig/Symbol.map

84

this is used by ifconfig (sbin/ifconfig/sfp.c) right?

[obiwac]

lib/libifconfig/Symbol.map

84

ah no its defined statically in the header, you wrote that in your description already, sorry

[mckusick]

Mentor approval for commit.