x86, mrst: The shutdown for MRST requires the SCU IPC mechanism

Fix the build failure reported by Randy.
Reported-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Alan Cox <alan@linux.intel.com>
LKML-Reference: <20101115173110.6877.83958.stgit@localhost.localdomain>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

arch/x86/Kconfig

@@ -399,6 +399,7 @@ config X86_MRST
 	select APB_TIMER
 	select I2C
 	select SPI
+	select INTEL_SCU_IPC
 	---help---
 	  Moorestown is Intel's Low Power Intel Architecture (LPIA) based Moblin
 	  Internet Device(MID) platform. Moorestown consists of two chips: