xtest: copy dma-heap.h from Linux kernel v6.9

Copy the needed dma-heap.h from Linux kernel v6.9. This is a stable ABI
so it doesn't have to be synced with each new kernel.

dma-heap.h can be removed when the cross toolchains provide the file.

Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
Reviewed-by: Joakim Bech <joakim.bech@linaro.org>
Acked-by: Jerome Forissier <jerome.forissier@linaro.org>
diff --git a/Android.mk b/Android.mk
index 803f7d4..79cb326 100644
--- a/Android.mk
+++ b/Android.mk
@@ -96,6 +96,7 @@
 
 LOCAL_C_INCLUDES += $(LOCAL_PATH)/host/xtest \
 		$(LOCAL_PATH)/host/xtest/adbg/include \
+		$(LOCAL_PATH)/host/xtest/include/uapi \
 		$(LOCAL_PATH)/ta/include \
 		$(LOCAL_PATH)/ta/supp_plugin/include \
 		$(LOCAL_PATH)/ta/create_fail_test/include \