sh: Fix up SH-3 and SH-4 driver dependencies.

Both shwdt and rtc-sh are only supported on SH-3 and SH-4 at
the moment, don't allow them to break the SH-2 and SH-5 (sh64)
builds.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

drivers/char/watchdog/Kconfig

@@ -602,7 +602,7 @@ config ZVM_WATCHDOG
 
 config SH_WDT
 	tristate "SuperH Watchdog"
-	depends on SUPERH
+	depends on SUPERH && (CPU_SH3 || CPU_SH4)
 	help
 	  This driver adds watchdog support for the integrated watchdog in the
 	  SuperH processors. If you have one of these processors and wish

drivers/rtc/Kconfig

@@ -394,7 +394,7 @@ config RTC_DRV_SA1100
 
 config RTC_DRV_SH
 	tristate "SuperH On-Chip RTC"
-	depends on RTC_CLASS && SUPERH
+	depends on RTC_CLASS && SUPERH && (CPU_SH3 || CPU_SH4)
 	help
 	  Say Y here to enable support for the on-chip RTC found in
 	  most SuperH processors.