Revert "Flag uses-sdk-library parsing changes"

This reverts commit ffe320b4.

Reason for revert: b/380156915#comment21

The logic is being accessed in early boot phase where the flag is not available. The flag guard was added because some apps had "String" versionMajor in their manifest and were failing to get installed. We have merged a work around to handle String versionMajor in Ie2a9809b49b4c7cd9136d610e98e6bd15a660ce6, so it should be fine to remove the flag guard.

Bug: 380156915
Test: presubmit
Flag: EXEMPT Flag unavailable in early boot
Change-Id: I8c22c903e5ae388a56c49fcf15c313049f3e6dd3