Use debug log SMC in tests rather than writing directly to UART.

Bug: 115484857
Change-Id: I67f94e740420f8e071bdb7a42712cc93690296d9
diff --git a/test/hftest/hftest.py b/test/hftest/hftest.py
index 3fa902e..dcb4634 100755
--- a/test/hftest/hftest.py
+++ b/test/hftest/hftest.py
@@ -165,11 +165,13 @@
 
 
 def hftest_lines(raw):
-    return [
-        line[len(HFTEST_LOG_PREFIX):]
-        for line in raw.splitlines()
-        if line.startswith(HFTEST_LOG_PREFIX)
-    ]
+    lines = []
+    for line in raw.splitlines():
+        if line.startswith("VM "):
+            line = line[len("VM 0: "):]
+        if line.startswith(HFTEST_LOG_PREFIX):
+            lines.append(line[len(HFTEST_LOG_PREFIX):])
+    return lines
 
 
 def Main():