Create a adb_debug.prop for test harness ramdisk

build/make/core/Makefile creates an adb_debug.prop for test ramdisk by
using adb_debug.prop of debug_ramdisk as input, and adding some
additional test harness specific properties. This CL introduces a
genrule and prebuilt_root soong module to do this processing for soong
only builds

Bug: 398023184
Bug: 439586630
Test: Used lz4 and cpio to unzip and compare `vendor_ramdisk-test-harness.img`
created in make and soong builds

Change-Id: I539d5db1f3014396216f726173a3677be037f9fd