RootCanal: Return accurate phy types in extended advertising reports

The primary phy type used to be hardcoded to LE 1M, and the secondary
phy to No packets. This change retrieves the phy types from the
extended advertising pdu.

Bug: 329259305
Test: m root-canal
Test: atest rootcanal_ll_test
Flag: EXEMPT, tool change
Change-Id: I3cabc13087dbb89d059201172317930aa1e62649