Add AHB_allocate2 + get/setDataSpace

Also fix that some ADataSpace enum values were not prefixed
with ADATASPACE_*

Test: atest AHardwareBufferTest
Bug: 315475131
Change-Id: Ie92f416a209501fa8fdc9b3593ea6d3bb68eaa48
diff --git a/libs/ui/Gralloc3.cpp b/libs/ui/Gralloc3.cpp
index 474d381..152b35a 100644
--- a/libs/ui/Gralloc3.cpp
+++ b/libs/ui/Gralloc3.cpp
@@ -371,7 +371,7 @@
 
 status_t Gralloc3Allocator::allocate(std::string /*requestorName*/, uint32_t width, uint32_t height,
                                      android::PixelFormat format, uint32_t layerCount,
-                                     uint64_t usage, uint32_t bufferCount, uint32_t* outStride,
+                                     uint64_t usage, uint32_t* outStride,
                                      buffer_handle_t* outBufferHandles, bool importBuffers) const {
     IMapper::BufferDescriptorInfo descriptorInfo;
     sBufferDescriptorInfo(width, height, format, layerCount, usage, &descriptorInfo);
@@ -383,6 +383,8 @@
         return error;
     }
 
+    constexpr auto bufferCount = 1;
+
     auto ret = mAllocator->allocate(descriptor, bufferCount,
                                     [&](const auto& tmpError, const auto& tmpStride,
                                         const auto& tmpBuffers) {