staging: comedi: 8253.h: remove the unused i8253_cascade_ns_to_timer_*()

#define I8254_OSC_BASE_2MHZ		500

#define I8254_OSC_BASE_1MHZ		1000

static inline void i8253_cascade_ns_to_timer_2div_old(int i8253_osc_base,

						      unsigned int *d1,

						      unsigned int *d2,

						      unsigned int *nanosec,

						      int round_mode)

{

	int divider;

	int div1, div2;

	int div1_glb, div2_glb, ns_glb;

	int div1_lub, div2_lub, ns_lub;

	int ns;

	divider = (*nanosec + i8253_osc_base / 2) / i8253_osc_base;

	/* find 2 integers 1<={x,y}<=65536 such that x*y is

	   close to divider */

	div1_lub = div2_lub = 0;

	div1_glb = div2_glb = 0;

	ns_glb = 0;

	ns_lub = 0xffffffff;

	div2 = 0x10000;

	for (div1 = divider / 65536 + 1; div1 < div2; div1++) {

		div2 = divider / div1;

		ns = i8253_osc_base * div1 * div2;

		if (ns <= *nanosec && ns > ns_glb) {

			ns_glb = ns;

			div1_glb = div1;

			div2_glb = div2;

		}

		div2++;

		if (div2 <= 65536) {

			ns = i8253_osc_base * div1 * div2;

			if (ns > *nanosec && ns < ns_lub) {

				ns_lub = ns;

				div1_lub = div1;

				div2_lub = div2;

			}

		}

	}

	*nanosec = div1_lub * div2_lub * i8253_osc_base;

	*d1 = div1_lub & 0xffff;

	*d2 = div2_lub & 0xffff;

	return;

}

static inline void i8253_cascade_ns_to_timer_power(int i8253_osc_base,

						   unsigned int *d1,

						   unsigned int *d2,

						   unsigned int *nanosec,

						   int round_mode)

{

	int div1, div2;

	int base;

	for (div1 = 2; div1 <= (1 << 16); div1 <<= 1) {

		base = i8253_osc_base * div1;

		round_mode &= TRIG_ROUND_MASK;

		switch (round_mode) {

		case TRIG_ROUND_NEAREST:

		default:

			div2 = (*nanosec + base / 2) / base;

			break;

		case TRIG_ROUND_DOWN:

			div2 = (*nanosec) / base;

			break;

		case TRIG_ROUND_UP:

			div2 = (*nanosec + base - 1) / base;

			break;

		}

		if (div2 < 2)

			div2 = 2;

		if (div2 <= 65536) {

			*nanosec = div2 * base;

			*d1 = div1 & 0xffff;

			*d2 = div2 & 0xffff;

			return;

		}

	}

	/* shouldn't get here */

	div1 = 0x10000;

	div2 = 0x10000;

	*nanosec = div1 * div2 * i8253_osc_base;

	*d1 = div1 & 0xffff;

	*d2 = div2 & 0xffff;

}

static inline void i8253_cascade_ns_to_timer(int i8253_osc_base,

					     unsigned int *d1,

					     unsigned int *d2,