Staging: epl: remove unneeded files

There were 3 .c files that was not used in the drivers/staging/epl/
directory.  This patch removes these unused files.

Cc: Daniel Krueger <daniel.krueger@systec-electronic.com>
Cc: Ronald Sieber <Ronald.Sieber@systec-electronic.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>