HDMICEC: Update LogHelper

Since logcat doesn't clear reliably, test should check for the latest
log entries.

Test: atest HdmiCecRemoteControlPassThroughTest
Bug: 159691675
Change-Id: I3664e4f89bd662b69d7f430622a9646b8d632955
diff --git a/hostsidetests/hdmicec/src/android/hdmicec/cts/LogHelper.java b/hostsidetests/hdmicec/src/android/hdmicec/cts/LogHelper.java
index b194bb9..a7692f38 100644
--- a/hostsidetests/hdmicec/src/android/hdmicec/cts/LogHelper.java
+++ b/hostsidetests/hdmicec/src/android/hdmicec/cts/LogHelper.java
@@ -51,7 +51,6 @@
             String line = in.nextLine();
             if (line.startsWith("I/" + tag)) {
                 testString = line.split(":")[1].trim();
-                break;
             }
         }
         device.executeAdbCommand("logcat", "-c");
@@ -90,7 +89,6 @@
                             Arrays.asList(in.nextLine().split(":")[1].trim().split(", "));
                     mSupportedAudioFormats =
                             Lists.transform(mFormatsLine, fl -> Integer.parseInt(fl));
-                    break;
                 }
             }
         }