pluging: add missing of dependency syslog on teec

[etienne-lms]

Adds missing dependency of plugins/syslog example on libteec header files that are brought in by libteec. The issue was reported by compiler with the below build error message:

/tmp/optee/optee_examples/plugins/syslog/syslog_plugin.c:8:10: fatal error: tee_plugin_method.h: No such file or directory 8 | #include | ^~~~~

Signed-off-by: Etienne Carriere etienne.carriere@linaro.org

[jenswi-linaro]

Acked-by: Jens Wiklander <jens.wiklander@linaro.org>

[etienne-lms]

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