Avoid redundant getAllocatableBytes() calls.

Shuffle around the ordering of resolveInstallVolume() so that we
determine the fitsOnInternal value while doing a drive-by of all
possible target volumes.  This way we only call getAllocatableBytes()
internal storage once.

Bug: 70985520
Test: atest android.content.pm.PackageHelperTests
Change-Id: I8273c239af4a13b1db17f320e15ee0ef2dc89186