Staging: fbtft: removed trailing whitespace

The following patch fixes the checkpatch.pl warning:
Removed all trailing whitespace in fb_s6d1121.c

Signed-off-by: Yeliz Taneroglu <yeliztaneroglu@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>