LE: Use LE specific I/O capabilities

In an attempt to make the I/O capability configuration more reasable and
overwritable per platform, the BR/EDR specific I/O capabilities were
used for LE. In SMP, the I/O capabilities flag is mapped differently,
thus a separate flag is required to configure the LE I/O capabilities.

Bug: 18245986
Change-Id: I6b4ba8f8a1d60ea25729e49d305e3653e94928c6