Validate the size of all dex paths eagerly

Also, increase the PKG_PATH_MAX which is used as the max path length to
1024. This should accommodate reasonably long dex path (to cover for
longer secondary dex files paths).

If a dex path  exceeds 1024 characters the dex file will not be compiled.

Bug: 63285397
Test: manual
1) create an artifical long paths under gmscore:
2) update /data/system/package-dex-usage.list to simulate the use of those
dex file
3) run `adb shell cmd package compile -r bg-dexopt --secondary-dex
com.google.android.gms`
4) observe that a 256+ characters dex path is ok while a 1024+ long one
fails.
5) run `adb shell cmd package reconcile-secondary-dex-files
com.google.android.gms` and check no errors are present.

Change-Id: I23b34013e32c5c64ca9c1381cc4d8d67e7121cc8