include: completion.h: Convert the rest of the dummy functions to macros

include: completion.h: Convert the rest of the dummy functions to macros

While we declare some of our dummy functions as "inline" we do not also
declare them as "static" and so it is possible for the compiler to
decide to make these as global functions instead. This can lead to link
time failures in some cases, such as "allyesconfig". As these are just
dummy functions, convert them to a macro instead.

Signed-off-by: Tom Rini <trini@konsulko.com>