Fix issue #1324: No audible call-waiting indication when in-call volume is low
Fix issue #1324: No audible call-waiting indication when in-call volume
is low

http://code.google.com/p/android/issues/detail?id=1324
Re-base the internally generated in-call audio volume so that it is
never muted, which is already the case for the hardware routed in-call
audio.

xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base