L2CAP: Failed to send data to remote device on LE transport.

Precondition:
1. Remote device is Dual mode device and uses same BD_ADDR
   for both BREDR and LE transport (i.e no privacy enabled)
2. Connection on BREDR goes to sniff mode while there is active
   data transfer on LE transport (i.e. during Step 5 as per below
         use case).
   Steps to reproduce:
   1. Pair and connect RD1 and RD2
   2. RD2 is now active, confirmed that music playback is heard
      over Rd2
   3. Make RD1 active, check for audio presence
   4. Make RD2 active, check for audio presence
   5. Repeat step 3-4 multiple times
   6. Randomly after 2-3 attempts at step 3 audio loss is observed

Fix:
This change checks the transport before checking the power
mode associated with the l2cap lcb. If the transport is LE
it would return immediately.

Test: After above steps issue not seen
Tag: #feature
Bug: 208221015

Change-Id: I99ba5c67a34be06c543bd531ef392ef270ca00b8