perfcounters: select ANON_INODES

The perfcounters subsystem depends on CONFIG_ANON_INODES facilities,
so make sure it's selected.
Signed-off-by: NIngo Molnar <mingo@elte.hu>

init/Kconfig

@@ -741,6 +741,7 @@ config PERF_COUNTERS
 	bool "Kernel Performance Counters"
 	depends on HAVE_PERF_COUNTERS
 	default y
+	select ANON_INODES
 	help
 	  Enable kernel support for performance counter hardware.