Various minor changes on optee examples

Prefix test applications for the examples with 'optee_example_'.
Gitignore the generate test applications.
Few extra minor changes as make verbosity and source coding style.
STR_TRACE_USER_TA is deprecated.
Update README.

Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>
Reviewed-by: Joakim Bech <joakim.bech@linaro.org>
diff --git a/random/ta/include/random_example_ta.h b/random/ta/include/random_ta.h
similarity index 79%
rename from random/ta/include/random_example_ta.h
rename to random/ta/include/random_ta.h
index d40bb63..30eeead 100644
--- a/random/ta/include/random_example_ta.h
+++ b/random/ta/include/random_ta.h
@@ -24,15 +24,19 @@
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  * POSSIBILITY OF SUCH DAMAGE.
  */
-#ifndef TA_RANDOM_EXAMPLE_H
-#define TA_RANDOM_EXAMPLE_H
 
-/* This UUID is generated with uuidgen
-   the ITU-T UUID generator at http://www.itu.int/ITU-T/asn1/uuid.html */
-#define TA_RANDOM_EXAMPLE_UUID { 0xb6c53aba, 0x9669, 0x4668, \
+#ifndef __RANDOM_TA_H__
+#define __RANDOM_TA_H__
+
+/*
+ * This UUID is generated with uuidgen
+ * the ITU-T UUID generator at http://www.itu.int/ITU-T/asn1/uuid.html
+ */
+#define TA_RANDOM_UUID \
+	{ 0xb6c53aba, 0x9669, 0x4668, \
 		{ 0xa7, 0xf2, 0x20, 0x56, 0x29, 0xd0, 0x0f, 0x86} }
 
-/* The Trusted Application Function ID(s) implemented in this TA */
-#define TA_EXAMPLE_RANDOM_GENERATE	0
+/* The function ID implemented in this TA */
+#define TA_RANDOM_CMD_GENERATE		0
 
-#endif /* TA_RANDOM_EXAMPLE_H */
+#endif /* __RANDOM_TA_H__ */