Move the cleanup code of SAP/P2P_GO type adapters to
new API and call the API from hdd_stop_adapter_ext().
Move ucfg_ipa_flush() to end of cleanup as it is specific to pdev.
New API:hdd_stop_sap_go_adapter()
Change-Id: I046312a4a928889c7be30182b27300e0b1af2fd6
CRs-Fixed: 3523806