p2p: add MANAGE_WIFI_AUTO_JOIN permission for CTS external approver tests

Wi-Fi Direct external approver APIs require MANAGE_WIFI_AUTO_JOIN
permission and CTS tests need to use Shell to invoke these
privelege APIs.

Bug: 218166551
Bug: 159038892
Test: atest ConcurrencyTest
Change-Id: Ia5c1c749e38fe94992c6364d0fd6117707834eb5