passpoint-r2: change return type of getMatchingOsuProviders

This change is required to show signal strength with OSU provider name
on UI.

Bug: 119514793
Test: ./frameworks/opt/net/wifi/tests/wifitests/runtests.sh
Test: tested with R1 AP for installing profile and R2 AP for connection
Change-Id: Ice99d176353d539e511717ccc7a4aba51d83ed48
Signed-off-by: Ecco Park <eccopark@google.com>
4 files changed