[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/sni/time.c

@@ -4,6 +4,7 @@
 
 #include <asm/sni.h>
 #include <asm/time.h>
+#include <asm-generic/rtc.h>
 
 #define SNI_CLOCK_TICK_RATE     3686400
 #define SNI_COUNTER2_DIV        64
@@ -71,7 +72,7 @@ static __init unsigned long dosample(void)
 /*
  * Here we need to calibrate the cycle counter to at least be close.
  */
-__init void sni_cpu_time_init(void)
+void __init plat_time_init(void)
 {
 	unsigned long r4k_ticks[3];
 	unsigned long r4k_tick;
@@ -146,3 +147,8 @@ void __init plat_timer_setup(struct irqaction *irq)
 	        break;
 	}
 }
+
+unsigned long read_persistent_clock(void)
+{
+	return -1;
+}