beeceem: Replace C99 comments with C89 ones and remove unneeded comments in InterfaceRx.c

This patch replaces C99-style with C89-style comments.
Additionally, code fragments that have been commented out are removed;
the same applies to meaningless comments.

Signed-off-by: Matthias Oefelein <ma.oefelein@arcor.de>
Signed-off-by: Ralph Mueck <linux-kernel@rmueck.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>