sysfs: add missing symlinks for cpu/node

Add the following patterns of symlinks:
 - /sys/bus/cpu/drivers/processor/cpu*
 - /sys/bus/node/devices/node*

And slightly change how /sys/devices/system/cpu/cpu*/node* are created
to avoid duplicate lookups

Change-Id: Id94a4d157da06d75f6bd450d5bd9a9e7709a1414

kernel/ap.c

@@ -258,6 +258,12 @@ cpu_sysfs_setup(void)
 		if (error) {
 			panic("cpu_sysfs_setup:sysfs_symlinkf failed\n");
 		}
+
+		error = sysfs_symlinkf(targeth, "/sys/bus/cpu/drivers/processor/cpu%d",
+				cpu);
+		if (error) {
+			panic("cpu_sysfs_setup:sysfs_symlinkf failed\n");
+		}
 	}
 
 	return;