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/Gralloc4.cpp b/libs/ui/Gralloc4.cpp
index 03ff58a..d6970e0 100644
--- a/libs/ui/Gralloc4.cpp
+++ b/libs/ui/Gralloc4.cpp
@@ -1069,7 +1069,7 @@
 
 status_t Gralloc4Allocator::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;
     if (auto error = sBufferDescriptorInfo(requestorName, width, height, format, layerCount, usage,
@@ -1084,6 +1084,8 @@
         return error;
     }
 
+    constexpr auto bufferCount = 1;
+
     if (mAidlAllocator) {
         AllocationResult result;
 #pragma clang diagnostic push