i9082: fix Wi-Fi P2P configuration

With KitKat, p2p0 must be the first interface due to IFNAME not being
specified.

https://android.googlesource.com/platform/frameworks/base/+/2de3a5762f4c77852810d8f6de6b60aabee9a38e

Also removed unneeded legacy compat

Change-Id: I6d9aef464d390584563c63df6ed585faf6df49ed