p2p: defer enabling p2p until the first command

WFD initializes P2P once P2P is enabled, i.e. wifi is enabled.
SAP will be disabled after toggle wifi off and on because P2P
interface will be initialized along with WFD.

Defer ENABLE_P2P command from getMessenger to avoid
this racing case.

Bug: 184504089
Test: atest FrameworksWifiTests
Change-Id: Ib9ebd17ad91ab43c7f825ed2c16967a3ef8edeee
2 files changed