staging: rtl8188eu: use __func__ in hal directory

Use __func__ instead of hardcoded function names to clear
checkpatch warnings.

Signed-off-by: Michael Straube <straube.linux@gmail.com>
Link: https://lore.kernel.org/r/20200917071330.31740-1-straube.linux@gmail.com


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