staging: vchiq_arm: use __func__ to get function name in debug message

Avoid hardcoded function name using "%s", __func__. This prevents
potential naming conflict if the function is eventually renamed.

Reported by checkpatch.pl

Signed-off-by: Gaston Gonzalez <gascoar@gmail.com>
Link: https://lore.kernel.org/r/20210919215914.539805-8-gascoar@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>