Kill ConnectivityManager.CONNECTIVITY_ACTION_SUPL

CONNECTIVITY_ACTION_SUPL is marked as a "temporary hack" and has
never been public. Remove this intent definition since no one is
receiving this intent and should use network callback to know the
connection change.

Bug: 109636544
Test: atest FrameworksNetTests
Change-Id: Ie9e5127742beba04f1c191e894e8a29fe1e704bb
Merged-In: Ie9e5127742beba04f1c191e894e8a29fe1e704bb
(cherry picked from aosp/1224697)