ANDROID: arm: allow hooks into ipi

Allow drivers to register hooks when IPIs are sent and handled. The
statistics of these IPIs are helpful in predicting CPU idle states.

Bug: 172588415
Signed-off-by: Lina Iyer <ilina@codeaurora.org>
Change-Id: I3706743ee4077157f8205870cecfff92841f40ce

arch/arm/kernel/smp.c

@@ -51,6 +51,10 @@
 #define CREATE_TRACE_POINTS
 #include <trace/events/ipi.h>
 
+EXPORT_TRACEPOINT_SYMBOL_GPL(ipi_raise);
+EXPORT_TRACEPOINT_SYMBOL_GPL(ipi_entry);
+EXPORT_TRACEPOINT_SYMBOL_GPL(ipi_exit);
+
 /*
  * as from 2.5, kernels no longer have an init_tasks structure
  * so we need some other way of telling a new secondary core