LinnuxKPI: drm2: retire timespec_to_jiffies()

Linux has removed timespec_to_jiffies() half a decade ago [1].
I cannot find any use of it anymore in recent drm-kmod branches
or in the tree so retire it.

While here also retire it from drm2.

Reported by:	emaste (D48318) [1].
Sponsored by:	The freeBSD Foundation
MFC after:	2 weeks
Reviewed by:	emaste, dumbbell (tested all drm-kmod versions, thanks!)
Differential Revision: https://reviews.freebsd.org/D48379

sys/compat/linuxkpi/common/include/linux/jiffies.h

@@ -68,19 +68,6 @@ extern uint64_t lkpi_msec2hz_rem;
 extern uint64_t lkpi_msec2hz_div;
 extern uint64_t lkpi_msec2hz_max;
 
-static inline int
-timespec_to_jiffies(const struct timespec *ts)
-{
-	u64 result;
-
-	result = ((u64)hz * ts->tv_sec) +
-	    (((u64)hz * ts->tv_nsec + NSEC_PER_SEC - 1) / NSEC_PER_SEC);
-	if (result > MAX_JIFFY_OFFSET)
-		result = MAX_JIFFY_OFFSET;
-
-	return ((int)result);
-}
-
 static inline int
 msecs_to_jiffies(uint64_t msec)
 {

sys/dev/drm2/drm_os_freebsd.h

@@ -447,7 +447,6 @@ extern unsigned long drm_linux_timer_hz_mask;
 #define jiffies			ticks
 #define	jiffies_to_msecs(x)	(((int64_t)(x)) * 1000 / hz)
 #define	msecs_to_jiffies(x)	(((int64_t)(x)) * hz / 1000)
-#define	timespec_to_jiffies(x)	(((x)->tv_sec * 1000000 + (x)->tv_nsec) * hz / 1000000)
 #define	time_after(a,b)		((long)(b) - (long)(a) < 0)
 #define	time_after_eq(a,b)	((long)(b) - (long)(a) <= 0)
 #define	round_jiffies(j)	((unsigned long)(((j) + drm_linux_timer_hz_mask) & ~drm_linux_timer_hz_mask))