Add basic VNDK support in Make

Add BOARD_VNDK_VERSION and LOCAL_USE_VNDK to specify the version of the
VNDK that will be used globally, and whether to use the VNDK on a module
basis.

If the board is using the VNDK:

* LOCAL_COPY_HEADERS may only be used by modules defining LOCAL_USE_VNDK
* LOCAL_USE_VNDK modules will compile against the NDK headers and stub
  libraries, but continue to use the platform libc++.
* LOCAL_USE_VNDK modules will not have the global includes like
  system/core/include, but it will use device-specific kernel headers.

This change does not attempt to enforce any linking constraints, that
will come in a later patch.

Test: out/build-aosp_arm.ninja is identical before/after
Change-Id: Icce65d4974f085093d500b5b2516983788fe2905
diff --git a/core/soong_config.mk b/core/soong_config.mk
index 995d9ed..1782ce5 100644
--- a/core/soong_config.mk
+++ b/core/soong_config.mk
@@ -47,6 +47,7 @@
 	echo '    "DeviceCpuVariant": "$(TARGET_CPU_VARIANT)",'; \
 	echo '    "DeviceAbi": ["$(TARGET_CPU_ABI)", "$(TARGET_CPU_ABI2)"],'; \
 	echo '    "DeviceUsesClang": $(if $(USE_CLANG_PLATFORM_BUILD),$(USE_CLANG_PLATFORM_BUILD),false),'; \
+	echo '    "DeviceVndkVersion": "$(BOARD_VNDK_VERSION)",'; \
 	echo ''; \
 	echo '    "DeviceSecondaryArch": "$(TARGET_2ND_ARCH)",'; \
 	echo '    "DeviceSecondaryArchVariant": "$(TARGET_2ND_ARCH_VARIANT)",'; \