[MIPS] Make timer interrupt frequency configurable from kconfig.

Make HZ configurable.  DECSTATION can select 128/256/1024 HZ, JAZZ can
only select 100 HZ, others can select 100/128/250/256/1000/1024 HZ if
not explicitly specified).  Also remove all mach-xxx/param.h files and
update all defconfigs according to current HZ value.

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/dec/time.c b/arch/mips/dec/time.c
index 74cb055..76e4d09 100644
--- a/arch/mips/dec/time.c
+++ b/arch/mips/dec/time.c
@@ -181,7 +181,7 @@
 	}
 
 	/* Set up the rate of periodic DS1287 interrupts.  */
-	CMOS_WRITE(RTC_REF_CLCK_32KHZ | (16 - LOG_2_HZ), RTC_REG_A);
+	CMOS_WRITE(RTC_REF_CLCK_32KHZ | (16 - __ffs(HZ)), RTC_REG_A);
 }
 
 EXPORT_SYMBOL(do_settimeofday);