Move wifi NAN feature to mixins options

[gowthambabu92]

NAN and hotspot cannot work simultaneously, as both wants the wifi chip tp be STA and AP simultaneously.

Move NAN to mixins options, whenever needed we can enable them in mixins.spec and validate.

Tests done:

1. Build nan=false
2. Flash BM, check wifi and hotspot on success
3. Build nan=true
4. Flash BM, #>pm list features | grep wifi
5. Check wifi aware is listing in features list
6. Verify wifi aware service is running from logcat

[sysopenci]

Android CI has started Engineering Build for this issue ,Please check the linked Tracked-On issue/Android CI Web for more details.

[sysopenci]

FAILURE: Android CI has completed Engineering Build for this issue.Please check the linked Tracked-On issue/Android CI Web for more details.

[sysopenci]

Improper Commit Message
Tracked on not found in commit message,
make sure Tracked-On: Jira-ticket is present.

[sysopenci]

Expected syntax:
Commit message one-line summary

  Extra paragraphs can be added here.

  Longer description that explains the problem / solution
  or whatever that needs to be said

  It can contain
    multiple lines
    multiple paragraphs
    blank lines
    references

  But each paragraph must be followed by a blank line

  However, you need to keep the 'Tracked-On', 'Change-Id',
  'Signed-off-by', ..., fields in the **lastest** paragraph of
  the commit message.

  Change-Id: I9e58f79c7faf7f0edb9792e8b5322ab161331141
  Tracked-On: https://jira.server.ext/browse/PROJECTA-123
  Signed-off-by: Developer Name <[email protected]>