ANDROID: vendor_hooks: Export direct reclaim trace points

Get direct reclaim info.

Bug: 190795589
Signed-off-by: Martin Liu <liumartin@google.com>
Change-Id: Ie66a3c87484a364a918c19b8e044c82f1afd6749
Signed-off-by: Richard Chang <richardycc@google.com>
(cherry picked from commit 12902c99)

mm/vmscan.c

@@ -69,6 +69,9 @@
 #undef CREATE_TRACE_POINTS
 #include <trace/hooks/vmscan.h>
 
+EXPORT_TRACEPOINT_SYMBOL_GPL(mm_vmscan_direct_reclaim_begin);
+EXPORT_TRACEPOINT_SYMBOL_GPL(mm_vmscan_direct_reclaim_end);
+
 struct scan_control {
 	/* How many pages shrink_list() should reclaim */
 	unsigned long nr_to_reclaim;