drivers/staging/nvec/Kconfig: remove trailing whitespace

This patch fixes checkpatch.pl error trailing whitespace.

Signed-off-by: Himangi Saraogi <himangi774@gmail.com>
Reviewed-by: Lisa Nguyen <lisa@xenapiadmin.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>