P2P: Add P2P_GROUP_MEMBER command to fetch client interface address

This allows local GO to fetch the P2P Interface Address of a P2P Client
in the group based on the P2P Device Address for the client. This
command should be sent only on a group interface (the same peer may be
in multiple concurrent groups).

Usage:
P2P_GROUP_MEMBER <P2P Device Address>

Output:
<P2P Interface Address>

CRs-Fixed: 999700
Git-commit: 57b38882e5f6fffa96c3397ba2c2436a872354df
Git-repo : git://w1.fi/srv/git/hostap.git
Signed-off-by: Purushottam Kushwaha <pkushwah@qti.qualcomm.com>

Change-Id: I29de5cdcc1f5d89097819623d84afe783cdf011c
4 files changed