BluetoothExt: Remove unused string

Change-Id: Ibbcf3442279ff4363caf3662b64d3d82fb32d2bd
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Change-Id: I7c694b812ca127ac22dc626e6c9b7f958081610e
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Change-Id: I86911f43e989905997dd3ee4e014d73be65920da
Handle multiple paths in the SECONDARY_STORAGE variable.

  Some devices list multiple paths for the SECONDARY_STORAGE
  variable, I.E. /storage/sdcard1:/storage/usbdisk
  When attempting to browse the device using the BT Ftp protocol
  accessing EXTERNAL STORAGE would result in failed path
  being mapped, and cause the system to fall into a loop.

  Its also assumed that the device will have only one real
  SECONDARY_STORAGE with the rest being linked in some
  manner back to the first.

Change-Id: I3edf73f2b7e31cbaa84cc9c5f22a49c9ffb12347
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Change-Id: Idac75c0401ee6e0fb30528ae67b433be4441f3df
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Change-Id: Id815026fe43d31db62cc74ed4c9f30f26d5696a3