[PATCH] tee: optee: fix build error caused by recent optee tracepoints feature

[Jisheng Zhang <Jisheng.Zhang@synaptics.com>]

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If build kernel without "O=dir", below error will be seen:

In file included from drivers/tee/optee/optee_trace.h:67,
                 from drivers/tee/optee/call.c:18:
./include/trace/define_trace.h:95:42: fatal error: ./optee_trace.h: No such file or directory
   95 | #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
      |                                          ^
compilation terminated.

Fix it by adding below line to Makefile:
CFLAGS_call.o := -I$(src)

Tested with and without "O=dir", both can build successfully.

Reported-by: Guenter Roeck <linux@roeck-us.net>
Suggested-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Jisheng Zhang <Jisheng.Zhang@synaptics.com>
---
 drivers/tee/optee/Makefile | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/tee/optee/Makefile b/drivers/tee/optee/Makefile
index 56263ae3b1d7..3aa33ea9e6a6 100644
--- a/drivers/tee/optee/Makefile
+++ b/drivers/tee/optee/Makefile
@@ -6,3 +6,6 @@ optee-objs += rpc.o
 optee-objs += supp.o
 optee-objs += shm_pool.o
 optee-objs += device.o
+
+# for tracing framework to find optee_trace.h
+CFLAGS_call.o := -I$(src)
-- 
2.31.0