Fix ManifestMerger issues

Set LOCAL_MIN_SDK_VERSION in car-setup-wizard-lib so that the build system
doesn't raise the minSdkVersion value specified in the manifest, which
causes ManifestMerger to error when trying to merge it into a package
that specifies a lower minSdkVersion.

Bug: 78447299
Test: m java
Change-Id: I7dd1a4313f3b15f286e20c39bc5c9698161d0c91