[MIPS] Deforest the function pointer jungle in the time code.

Hard to follow who is pointing what to where and why so it's simply getting
in the way of the time code renovation.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/sgi-ip27/ip27-timer.c

@@ -123,7 +123,7 @@ again:
 #include <asm/sn/sn0/hubio.h>
 #include <asm/pci/bridge.h>
 
-static __init unsigned long get_m48t35_time(void)
+unsigned long read_persistent_clock(void)
 {
         unsigned int year, month, date, hour, min, sec;
 	struct m48t35_rtc *rtc;
@@ -205,12 +205,10 @@ static cycle_t ip27_hpt_read(void)
 	return REMOTE_HUB_L(cputonasid(0), PI_RT_COUNT);
 }
 
-void __init ip27_time_init(void)
+void __init plat_time_init(void)
 {
 	clocksource_mips.read = ip27_hpt_read;
 	mips_hpt_frequency = CYCLES_PER_SEC;
-	xtime.tv_sec = get_m48t35_time();
-	xtime.tv_nsec = 0;
 }
 
 void __init cpu_time_init(void)