bluedroid: remove duplicate BLUETOOTH_QCOM_SW define

We're in an #if that depends on this variable being defined, so
definitely don't need to define it again.

Change-Id: I9b9f9fe825999f731cbcd999d59f2fc07fc764bf
Merge pull request #2 from CyanogenMod/cm-11.0

bluedroid: remove duplicate BLUETOOTH_QCOM_SW define