style(expect): normalize debugging messages

A minor style cleanup to the messages printed by the Expect scripts to
make them a bit more consistent and descriptive.

Signed-off-by: Chris Kay <chris.kay@arm.com>
Change-Id: Ibd8ccb4423bd5aaeffc99c2f3602123794dc6200
(cherry picked from commit 78ea2c38582da41eb8f9509a2130e702cdf0f1c9)
diff --git a/expect/spm-optee-sp-uart1.exp b/expect/spm-optee-sp-uart1.exp
index 289c91d..6ba7755 100644
--- a/expect/spm-optee-sp-uart1.exp
+++ b/expect/spm-optee-sp-uart1.exp
@@ -8,13 +8,13 @@
 
 expect {
 	"OP-TEE version: "  {
-		puts "<<OP-TEE version>>"
+		message "OP-TEE version"
 	}
 }
 
 expect {
 	"Primary CPU switching to normal world boot"  {
-		puts "<<OP-TEE initialized>>"
+		message "OP-TEE initialized"
 	}
 }