kmemleak: add TILE to the list of supported architectures.

All the necessary functionality was already there; we just need
to make it possible to select the config option.
Signed-off-by: NChris Metcalf <cmetcalf@tilera.com>

lib/Kconfig.debug

@@ -366,7 +366,7 @@ config SLUB_STATS
 config DEBUG_KMEMLEAK
 	bool "Kernel memory leak detector"
 	depends on DEBUG_KERNEL && EXPERIMENTAL && !MEMORY_HOTPLUG && \
-		(X86 || ARM || PPC || S390 || SPARC64 || SUPERH || MICROBLAZE)
+		(X86 || ARM || PPC || S390 || SPARC64 || SUPERH || MICROBLAZE || TILE)
 
 	select DEBUG_FS if SYSFS
 	select STACKTRACE if STACKTRACE_SUPPORT