bluetooth: Add support for remote_features

Expose Bluetooth remote features to the userspace. A2DP profile
setup in the userspace would need this information to
determine if the remote side supports EDR ACL link or not.

Change-Id: Ib6713707baaf30ffe872247313b2185ae2897385
Signed-off-by: Sunny Kapdi <sunnyk@codeaurora.org>