Support initial attach for HO failures due to network issues

- This feature is only used when handover request fails due to network error, i.e. IKE_PROTOCOL_ERROR_TYPE.

- In idle state, or not on voice / video call, Iwlan set handover failure mode as NO_FALLBACK_RETRY_SETUP_NORMAL if attempt count reach the configured threshold. Otherwise, to keep call continuity, Iwlan will always set handover failure mode as NO_FALLBACK_RETRY_HANDOVER.

Bug: 226938560
Test: atest IwlanTests
Change-Id: I1099e708af74aaea13185a03bdb53757082d304c
6 files changed