[MIPS] SNI RM updates

- use RTC_CLASS instead of GEN_RTC
- get rid of ds1216 in favour of a RTC_CLASS driver
- use correct console device for older RM400
- use physical addresses for 82596 device
- use 128 byte L1 cache line size (this is needed because most of the
  SNI caches are using 128 L2 cache lines)

Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 2076d47..24661d6 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -918,8 +918,8 @@
 
 config MIPS_L1_CACHE_SHIFT
 	int
-	default "4" if MACH_DECSTATION || SNI_RM
-	default "7" if SGI_IP27
+	default "4" if MACH_DECSTATION
+	default "7" if SGI_IP27 || SNI_RM
 	default "4" if PMC_MSP4200_EVAL
 	default "5"