Adding WINDOW_MANAGER_NATIVE_BOOT and window_manager_use_blast_adapter flags

For ViewRootImpl on BLAST experiment, setting up namespace and flag to
turn on Blast adapter through P/H experiment

Bug: 147096935
Test: build, boot, adb shell device_config put
window_manager_native_boot wm_use_blast_adapter true/false
check that BLAST adapter is turned on/off as expected
Change-Id: Ie1b158721ac9b751fcf3954310259f14486d3bb8