Use uint_32 for UidOwnerMatchType

The enum is already using 12 bits, so using fewer bits loses information.
This is in sync with the UidOwnerValue struct used to contain this data.

Test: atest resolv_integration_test
Test: atest resolv_unit_test

Bug: 325150155
Change-Id: Ide0ccea9614cda803b3700a0cc22977e9608209e