subprojects: Add Android VNDK to compile test the HAL

The Android HAL has quite some Android-specific dependencies (such as
libhardware) which are not part of regular linux distributions.

To compile-test the HAL on a Linux x86 system, we have added some stubs.

This means that each time we add a new Android specific dependency, we need to
write an associated stub for it, which can get tricky, especially for complex
C++ classes such as GraphicBufferAllocator.

It would be easier if we could import the includes and the required libraries we
need from Android so that we can build-test the HAL.
The Vendor Native Development Kit (VNDK) provides all the libraries
that a vendor service (such as the libcamera HAL) can link against.

Add the VNDK as a subproject of libcamera and add the necessary meson bits so
that we can compile test the Android HAL on linux without having to stub
anything.

Signed-off-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>

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