[pm] derive correct abi override during prepare package

This is needed so that the ABI values in parsedPkg will be correct
before they are copied to pkgSetting during scan package.

BUG: 163888243
Test: atest android.extractnativelibs.cts.CtsExtractNativeLibsHostTestAbiOverride
Change-Id: I48947c5170ea0b732d3e961c9735b3a218f9a81b