time: fix gcc warnings on MIPS64

Commit 8dfafdde88 introduced
new gcc warnings on MIPS64:

time.c: In function 'tick_to_time':
time.c:59:2: warning: comparison of distinct pointer types lacks a cast [enabled by default]
time.c:59:2: warning: passing argument 1 of '__div64_32' from incompatible pointer type [enabled by default]
In file included from time.c:10:0:
./u-boot-mips/include/div64.h:22:17: note: expected 'uint64_t *' but argument is of type 'long long unsigned int *'
time.c: In function 'usec_to_tick':
time.c:76:2: warning: comparison of distinct pointer types lacks a cast [enabled by default]
time.c:76:2: warning: passing argument 1 of '__div64_32' from incompatible pointer type [enabled by default]
In file included from time.c:10:0:
./u-boot-mips/include/div64.h:22:17: note: expected 'uint64_t *' but argument is of type 'long long unsigned int *'

Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>

lib/time.c

@@ -51,7 +51,7 @@ unsigned long long __weak notrace get_ticks(void)
 	return ((unsigned long long)gd->timebase_h << 32) | gd->timebase_l;
 }
 
-static unsigned long long notrace tick_to_time(unsigned long long tick)
+static unsigned long long notrace tick_to_time(uint64_t tick)
 {
 	unsigned int div = get_tbclk();
 
@@ -71,7 +71,7 @@ unsigned long __weak notrace timer_get_us(void)
 }
 static unsigned long long usec_to_tick(unsigned long usec)
 {
-	unsigned long long tick = usec * get_tbclk();
+	uint64_t tick = usec * get_tbclk();
 	usec *= get_tbclk();
 	do_div(tick, 1000000);
 	return tick;