Fix crash when no power_profile is specified

Always connected devices don't have power_profiles,
so handle the case where the default cpu speed count of
1 is used on a device with more cpu speeds.

Bug:23776983
Change-Id: Ifdddad2f28eea5b730833622a6b6043b3086efd2

core/java/com/android/internal/os/KernelCpuSpeedReader.java

@@ -58,7 +58,7 @@ public class KernelCpuSpeedReader {
             TextUtils.SimpleStringSplitter splitter = new TextUtils.SimpleStringSplitter(' ');
             String line;
             int speedIndex = 0;
-            while ((line = reader.readLine()) != null) {
+            while (speedIndex < mLastSpeedTimes.length && (line = reader.readLine()) != null) {
                 splitter.setString(line);
                 Long.parseLong(splitter.next());
 

core/java/com/android/internal/os/KernelUidCpuTimeReader.java

@@ -137,7 +137,7 @@ public class KernelUidCpuTimeReader {
                 mLastPowerMaUs.put(uid, powerMaUs);
             }
         } catch (IOException e) {
-            Slog.e(TAG, "Failed to read uid_cputime", e);
+            Slog.e(TAG, "Failed to read uid_cputime: " + e.getMessage());
         }
         mLastTimeReadUs = nowUs;
     }