audio policy: fix typo in comment in AudioPolicyManager.cpp

#define LOG_TAG "APM_AudioPolicyManager"

// Need to keep the log statements even in production builds

// to enable VERBOSE logging dynamicstartAudioSourceally.

// to enable VERBOSE logging dynamically.

// You can enable VERBOSE logging as follows:

// adb shell setprop log.tag.APM_AudioPolicyManager V

#define LOG_NDEBUG 0