watchdog: Intel SCU Watchdog: Fix build and remove duplicate code

Trying to build the Intel SCU Watchdog fails for me with gcc 4.6.0 -
$ gcc --version | head -n 1
gcc (GCC) 4.6.0 20110513 (prerelease)

like this :
  CC      drivers/watchdog/intel_scu_watchdog.o
In file included from drivers/watchdog/intel_scu_watchdog.c:49:0:
/home/jj/src/linux-2.6/arch/x86/include/asm/apb_timer.h: In function ‘apbt_time_init’:
/home/jj/src/linux-2.6/arch/x86/include/asm/apb_timer.h:65:42: warning: ‘return’ with a value, in function returning void [enabled by default]
drivers/watchdog/intel_scu_watchdog.c: In function ‘intel_scu_watchdog_init’:
drivers/watchdog/intel_scu_watchdog.c:468:2: error: implicit declaration of function ‘sfi_get_mtmr’ [-Werror=implicit-function-declaration]
drivers/watchdog/intel_scu_watchdog.c:468:32: warning: assignment makes pointer from integer without a cast [enabled by default]
cc1: some warnings being treated as errors

make[1]: *** [drivers/watchdog/intel_scu_watchdog.o] Error 1
make: *** [drivers/watchdog/intel_scu_watchdog.o] Error 2

Additionally, linux/types.h is needlessly being included twice in 
drivers/watchdog/intel_scu_watchdog.c

Signed-off-by: Jesper Juhl <jj@chaosbits.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index 022f9eb..9536d38 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -535,8 +535,7 @@
 
 config INTEL_SCU_WATCHDOG
 	bool "Intel SCU Watchdog for Mobile Platforms"
-	depends on WATCHDOG
-	depends on INTEL_SCU_IPC
+	depends on X86_MRST
 	---help---
 	  Hardware driver for the watchdog time built into the Intel SCU
 	  for Intel Mobile Platforms.