Build bootctl and enable installation to inactive slot on Pixel devices

[capntrips]

This adds the necessary sources from AOSP and builds the bootctl binary along with Magisk. I'm submitting this as a draft, as I imagine it would make more sense to move the individual libraries into repos (as is already done in the native module), port it from CMake to ndk-build, and merge it into the native module.

The sources for bootctl, jsoncpp, libbacktrace, libbase, libcutils, libcxx, libcxxabi, libdl, libfmq, libhidl, libhwbinder, liblog, libprocessgroup, libsystem, libutils, and libvndksupport are linked inline. The sources for android.hardware.boot@1.0, android.hardware.boot@1.1, android.hardware.boot@1.2, android.hidl.base@1.0, android.hidl.manager@1.0, android.hidl.manager@1.1, and android.hidl.manager@1.2 were generated by hidl-gen during the build process described in #4955.

I was unable to use the libcxx and libcxxabi submodule or NDK build from Magisk. This may be resolved by porting it from CMake to ndk-build. Someone with a better understanding of how linking shared objects works might be able to simplify the entire thing.

I limited the bootctl build to arm64-v8a for now, though I was able build binaries for armeabi-v7a, x86, and x86_64 in the AOSP build system. I made no attempt to build them with the submodule.

Closes #4955

[yujincheng08]

Try #5173