nimble/ll: Fix not reporting Extended Advertising in LE features
nimble/ll: Fix not reporting Extended Advertising in LE features

If Extended Advertising is enabled proper bit needs to be set in
support features.

< HCI Command: LE Read Local Supported Features (0x08|0x0003) plen 0
> HCI Event: Command Complete (0x0e) plen 12
      LE Read Local Supported Features (0x08|0x0003) ncmd 1
        Status: Success (0x00)
        Features: 0xff 0x59 0x00 0x00 0x00 0x00 0x00 0x00
          LE Encryption
          Connection Parameter Request Procedure
          Extended Reject Indication
          Slave-initiated Features Exchange
          LE Ping
          LE Data Packet Length Extension
          LL Privacy
          Extended Scanner Filter Policies
          LE 2M PHY
          LE Coded PHY
          LE Extended Advertising
          Channel Selection Algorithm #2

apache/mynewt-nimble,apache/mynewt-nimble,apache/mynewt-nimble,apache/mynewt-nimble,apache/mynewt-nimble