Make CtsPriv and CtsPrivShim build standalone.

Bug: 148489495
Test: build/soong/soong_ui.bash --make-mode -j80 showcommands dist TARGET_BUILD_APPS='CtsShim CtsShimPriv CtsShimPrivUpgrade CtsShimPrivUpgradeWrongSHA CtsShimTargetPSdk'  TARGET_BUILD_VARIANT=userdebug TARGET_PRODUCT=aosp_arm64
Change-Id: I1bd43b7ef9b4ebd5a24712306285c0ffd0e34d23
1 file changed