Add extension sdk finalization into update_prebuilts.py

This change adds another required arg, -e <int>, which is
required when using -f <int> to finalize an sdk. -e is used
to specify the extension sdk level to finalize at the same
time, which is required when finalizing an sdk level.

Bug: 228451704
Test: ./update_prebuilts.py --bug 1 -f 33 -e 3 8415607
Change-Id: Ibdd04d01956cc8f1cf52d0d474d94d6f27878556
1 file changed