linuxkpi: Define `COUNT_ARGS()` and `CONCATENATE()`

`COUNT_ARGS()` counts the number of arguments it is passed. The
implementation is heavily inspired from the one of `CTR()`.

`CONCATENATE()` is an

linuxkpi: Define `COUNT_ARGS()` and `CONCATENATE()`

`COUNT_ARGS()` counts the number of arguments it is passed. The
implementation is heavily inspired from the one of `CTR()`.

`CONCATENATE()` is an alias for `__CONCAT()`.

Reviewed by: emaste
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D57584

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