Map SELINUX_LATEST_CHANGES to Build.CUR_DEVELOPMENT

The SELINUX_LATEST_CHANGES AppCompat flag should always put the app in
the SELinux domain targeting the current release. Fixing its target SDK
to CUR_DEVELOPMENT ensures that it always gets added to the latest
SELinux domain.

Bug: 193151214
Bug: 171572148
Test: atest CtsSelinuxTargetSdkCurrentTestCases
Test: atest CtsSelinuxTargetSdk30TestCases
Test: atest CtsSelinuxTargetSdk29TestCases
Test: atest CtsSelinuxTargetSdk28TestCases
Test: atest CtsSelinuxTargetSdk27TestCases
Test: atest CompatChangesSelinuxTest
Change-Id: I643a65e79e076518c27c31d05229ee509fa35ec5