wifi: Add provision to create/delete dynamic interface(s)

This commit does following:
create/delete softap interface at runtime, if needed.
create/delete station interface at runtime, if needed.

Bug: 146539882
Bug: 121156971
Test: Manual - Basic wifi sanity test.
Change-Id: I6ab9c9e134d2f09e27283c9e60df885392834de4
Signed-off-by: Vinay Gannevaram <quic_vganneva@quicinc.com>