parade/ps8640: Clean up

Sort out some style issues that were identified by Paul.

Change-Id: I9ed946ae613c87234f8c9824eb14b8d28909dfcf
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Reviewed-on: https://review.coreboot.org/14064
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
2 files changed