staging: vchiq_core.h: fix CamelCase in function declaration

Renaming function declaration to avoid CamelCase use.

As this was already fixed in the function definition in commit
801b1aa0

 ("staging: vc04_services: fix CamelCase"), the current
change make the names of the variables in the function definition and
declartion match.

Reported by checkpatch.pl

Signed-off-by: Gaston Gonzalez <gascoar@gmail.com>
Link: https://lore.kernel.org/r/20211024212524.370078-4-gascoar@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>