add reverse dependency of CONFIG_SGI_XP upon CONFIG_SGI_GRU

Add a reverse dependency of CONFIG_SGI_XP upon CONFIG_SGI_GRU to Kconfig.
Signed-off-by: NDean Nelson <dcn@sgi.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

drivers/misc/Kconfig

@@ -430,6 +430,7 @@ config SGI_XP
 	depends on IA64_GENERIC || IA64_SGI_SN2 || IA64_SGI_UV || (X86_64 && SMP)
 	select IA64_UNCACHED_ALLOCATOR if IA64_GENERIC || IA64_SGI_SN2
 	select GENERIC_ALLOCATOR if IA64_GENERIC || IA64_SGI_SN2
+	select SGI_GRU if IA64_GENERIC || IA64_SGI_UV || (X86_64 && SMP)
 	---help---
 	  An SGI machine can be divided into multiple Single System
 	  Images which act independently of each other and have